JPH01276387A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a high security with a comparatively simple constitution by recording information with depending on the magnetizing direction of respective magnetic bars of a magnetic bar code. CONSTITUTION:Bar arranging positions 6a-6e are provided at a confirmation information recording part 6 composed of a magnetic bar code formed on the surface of a substrate 2 and the information is recorded with depending on the magnetizing direction of a magnetic bar 7. Consequently, even when a magnetic viewer, etc., are used, the arrangement pattern of the magnetizing direction of the magnetic bar 7 can not be discriminated and the confirmation information cannot be known. Thus, the high security can be obtained with the comparatively simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic recording media, and particularly to improving the security thereof.

The present invention is effectively applied to magnetic recording media, such as magnetic cards and securities, which require protection against forgery and tampering.

[Prior Art and Problems to be Solved by the Invention] Magnetic cards are widely used as cards that are convenient to carry and visually useful, and it is thought that their circulation will gradually increase.

Along with this, it is predicted that fraudulent uses such as forgery and falsification of magnetic cards will occur, and it is necessary to take measures against this.

As a countermeasure against this, conventionally, verification information that is related to the main information recorded magnetically is recorded in a recording format different from the recording format of the information recording described above. When reproducing the main information, the confirmation information is also reproduced and it is determined whether or not the confirmation information has a predetermined relationship with the main information.If there is no predetermined relationship, the cart is correct. It is determined that it is not a real thing. The recording form of the confirmation information is preferably one that is as difficult to forge and tamper with as possible, and conventionally, a magnetic barcode has been used as one of such magnetic patterns.

FIG. 4 is a schematic plan view showing a main part of an example of a magnetic card in which information is configured by a conventional magnetic bar code, and FIG. 5 is a sectional view taken along the line V--■.

In these figures, 2 is a base material, and 6 is an identification information recording section formed on the surface of the base material 2, which is a magnetic barcode. The confirmation information recording section is provided with five eight-position positions 6a to 6e, and in the figure, magnetic bars 7 are actually formed at two of them, 6a and 6d.

By the way, as shown in FIG. 5, in the conventional magnetic card, the magnetic strips 7 constituting the bar code are magnetized in the same direction. In this way, confirmation information consisting of conventional bar codes is recorded only by the arrangement of the presence or absence of the bars (ie, the arrangement pattern of the magnetic pars 7). - In the case of FIGS. 4 and 5 above, the confirmation information is rloooloJ.

Although not shown, in order to make it impossible to visually distinguish the arrangement pattern of the magnetic bars, a position where the magnetic bar 7 does not exist (6b in FIG. 4) is used.

6c, 6e), dummy bars may be formed on a non-magnetic material with similar shape, color, surface condition, and thickness.

However, in conventional magnetic cards such as those mentioned above, residual magnetization occurs in the magnetic pars, so if you use a commercially available magnetic pure, you can easily see the arrangement pattern of the magnetic pars and know the confirmation information. It was possible and the security was less than 1-minute.

SUMMARY OF THE INVENTION In view of the problems of the conventional technology described above, it is an object of the present invention to provide a magnetic recording medium that can achieve high security with a relatively simple configuration.

[Means for Solving the Problems] According to the present invention, the following objects are achieved in a magnetic recording medium in which information is recorded by a magnetic barcode, depending on the direction of magnetization of the magnetic pars constituting the barcode. It is characterized by the fact that information is recorded. Achieved by magnetic recording media.

The magnetic recording medium of the present invention has a main information recording side on which main information is magnetically recorded, and a confirmation information recording section on which confirmation information published related to the recorded contents of the main information recording side is recorded. However, an example is one in which the confirmation information recording section is composed of the magnetic barcode described above.

[Embodiments] Hereinafter, basic embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic plan view showing the main parts of a magnetic card which is an embodiment of the magnetic recording medium of the present invention, and FIG.
It is an H sectional view.

In these figures, 2 is a base material, and 6 is an identification information recording section formed on the surface of the base material 2, which is a magnetic barcode. The confirmation information recording section is provided with five bar arrangement positions 6a to 6e.

As the base material 2, for example, a synthetic resin sheet such as polyethylene terephthalate, polyvinyl chloride, or polycarbonate, paper, or the like can be used.

1] As the bipedal magnetic par 7, those commonly used as magnetic pars in conventional magnetic recording media of this type can be used. The magnetic part can be formed by, for example, silk screen printing, offset printing, letterpress printing, gravure printing, or the like. As printing ink,
As a magnetic material, the particle size is 10 pm or less, preferably 0.01~
5 pLm Ba-ferrite, Sr-ferrite, co
, 1st place: y-Fe203, y-Fe203, needle iron powder, CrO2, magnetite, and commonly used binder resins such as polyester resin, alkyd resin, vinyl resin, polyurethane resin, or mixed resin thereof. be able to. The mixing ratio of the binder resin and the magnetic material in the ink is appropriately set in consideration of the adhesion of the base material 2, the strength of the coating film, the voltage detected by the magnetic head, etc.
The range of 1jf is preferably 1/3 to 1, /
8 is appropriate.

In addition, a magnetic layer for individual information recording, such as writing and reading information by a magnetic hand, may be formed on the (material 2), and in some cases, the magnetic layer may be It is also possible to form the magnetic layer on the entire surface of the magnetic layer 2 and use a desired area of the magnetic layer as an individual information recording section.The magnetic layer may be made of a magnetic material commonly used in conventional magnetic recording media. In order to prevent the magnetic layer from being magnetized when the magnetic bar 7 is magnetized, the coercive force of the magnetic bar 7 is made smaller than the coercive force of the magnetic layer. It is desirable that the coercive force of the layer be 1773 or less.

Furthermore, a concealing layer may be provided to conceal the magnetic layer or magnetic layer, and the concealing layer may be made of a material conventionally used as a concealing layer in this type of magnetic recording medium (for example, a colored material such as silver ink). layers) can be used.

In addition, a wear-resistant layer may be provided on the concealing layer to prevent friction with the magnetic head. (e.g. a polyurethane layer) can be used.

The above-mentioned individual information recording section may be used as the main information recording side to magnetically record the card type and balance amount, and the above-mentioned magnetic barcode may be used as the confirmation information recording section to record the card type and approximate balance amount. . As shown in FIG. 2, in this embodiment, the direction of magnetization of each magnetic bar 7 constituting the barcode can be in the direction of arrow A or in the opposite direction of arrow B, depending on the position of the magnetic bar. be. In this embodiment, information is also recorded in this magnetic barcode based on the magnetization direction of each magnetic par 7. That is, if the information magnetized in the direction of arrow B is made to correspond to information rlJ, and the information magnetized in the direction of arrow B is made to correspond to information rOJ, then in the case of Fig. 2, the recorded confirmation information is "10010J". It is.

As shown in 1- below, in this example, information is recorded based on the magnetization direction of the magnetic par, and even if a commercially available magnetic viewer is used, the arrangement pattern of the magnetization direction of the magnetic par cannot be determined, so confirmation information cannot be obtained. Since this information cannot be known, security is sufficiently increased.

FIG. 6 is a schematic plan view showing the main parts of a magnetic card which is an embodiment of the magnetic recording medium of the present invention, and FIG.
■It is a sectional view.

Hereinafter, a specific example of manufacturing the magnetic card according to the embodiment shown in FIGS. 6 and 7 will be described.

First, the thickness of the large dimension that will be the car i/base material 2 is 250gn'.
A base material made of polyethylene terephthalate was prepared. A magnetic layer 5 constituting the main information recording side 4 shown in FIG. 6 was formed on the surface of this base material.

Next, the magnetic part 7 shown in FIGS. 6 and 7 was formed at a predetermined position on the surface of the base material by silk screen printing. Each magnetic par 7 is 9 km thick and 2 mm wide.
, the length was 7 mm. The following materials are used as magnetic ink for silk screen printing: acicular magnetic pigment γ-Fe20
3 45 parts VAGH (manufactured by Union Carbide) 9 parts by weight Tsurpets ioo 133 parts by weight cyclohexanone 2 Q Heavy-fj: 'KP
Isophorone 13 parts of heavy acid were kneaded in a roll mill to give a viscosity of about 100 poise.

Add 2.3 g of a 37.5% methyl ethyl ketone solution of Coronate L (manufactured by Nippon Polyurethane Co., Ltd.) to 100 parts by weight of the magnetic ink described in , stir thoroughly, and use this to make a plate of the desired pattern on silk screen Tetron 250 lines. Printed using a screen printing plate.

Next, a concealing layer 8 made of silver ink having a thickness of approximately 1:1 was formed on the entire surface so as to conceal the magnetic layer and magnetic layer 7 constituting the main information recording side 4.

Next, a wear-resistant layer 10 made of polyurethane having a thickness of about 2 pLm was formed on the entire surface of the "hiding layer".

The sheet body formed as follows is subjected to the prescribed ten methods (54
The magnetic cart was cut into pieces (mm x 86 mm) to obtain the magnetic cart shown in FIGS. 6 and 7 above.

FIG. 3 is a diagram for explaining a specific example of recording and reproducing information on a magnetic barcode using the magnetic card obtained in this manner.

While transporting the magnetic card in the direction of the arrow, move the magnetic head (
A write current having a waveform as shown in the figure was applied to the head cap (30 km long, track width 1 mm) to record information. The recorded information in this case is ``1OO10I.'' As a result, each magnetic bar 7 was magnetized in the direction shown in the figure.

The peak value (20 mA) of the write @ wave is larger than the current f11s required to obtain saturation magnetization. The magnetization state of each magnetic par 7 is illustrated with the direction of arrow A being positive.

In this way, the magnetic card on which information was recorded based on the magnetization direction of the magnetic bar was transported in the direction of arrow A and then reproduced using the recording magnetic head. The read voltage waveform output from the magnetic head was as shown in the figure. The waveform obtained by shaping this using the slice level Es shown in the figure is shown in the figure, and when this is logically summed with the pulse pulse shown in the figure, the calculated rear limb shape as shown in the figure is obtained. This playback information is rl
o 0101 and corresponds to recorded information.

In the above embodiment, the magnetic barcode information can be rewritten to desired information at any time. Therefore, although conventional magnetic bar codes such as those shown in FIGS. 4 and 5 contain fixed information, this embodiment can record variable information. In addition, in the embodiment described above, the total magnetic par arrangement position 6
Magnetic bars 7 are arranged at a to 6e, and as in the past, fixed information is recorded by turning the magnetic bars 7 a to 6e.
In addition to this, variation information can also be recorded by the seven magnetization directions of the magnetic bar. In this case, the dummy par can be placed at a position where no magnetic bar exists, as in the conventional case.

The magnetic barcode in the two-legged embodiment is confirmation information that is related to the main information recorded on the main information recording side, and the confirmation information includes fixed information such as the ticket type as well as fluctuations such as the approximate balance amount. Information can be recorded.

[Effects of the Invention] According to the magnetic recording medium of the present invention as described above, variable information can be recorded in addition to fixed information on a magnetic barcode, and this increases the recording capacity, so it is relatively easy to use. High security can be achieved with this configuration.

[Brief explanation of the drawing]

ff11 is a schematic plan view showing the main parts of the magnetic recording medium of the present invention, and FIG. 2 is a sectional view taken along line nn. FIG. 3 is a diagram for explaining a specific example of recording and reproducing information on a magnetic barcode using the magnetic recording medium of the present invention. FIG. 4 is a schematic plan view showing the main parts of a conventional magnetic card, and FIG. 5 is a sectional view taken along line V-V. FIG. 6 is a schematic plan view showing the main parts of the magnetic recording medium of the present invention, and FIG. 7 is a sectional view taken along the line 1--2. 22 base material, 4: main information recording side, 5: magnetic layer,
6: Confirmation information recording section, 6a to 6e: Magnetic bar arrangement position, 7: Magnetic bar 18: Hiding layer, 10: Wear-resistant layer. Agent Patent Attorney Johei Yamashita

Claims (2)

[Claims] (1) A magnetic recording medium in which information is recorded by a magnetic barcode, characterized in that information is recorded by the direction of magnetization of magnetic bars constituting the barcode. (2) It has a main information recording section in which main information is magnetically recorded and a confirmation information recording section in which confirmation information associated with the recorded contents of the main information recording side is recorded, and the confirmation information recording section is 2. The magnetic recording medium of claim 1, comprising the magnetic barcode.