JPH03240895A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To simplify the configuration of a reader/writer by arranging a magnet ism block bar mark at a bar code part provided at a magnetic recording layer, and forming a bar code with a part on the magnetism block bar mark as a no-signal area and a part between the magnetism block bar marks as a signal area. CONSTITUTION:The surface of a magnetic recording layer 4 in a bar code part 1 is partially covered with a magnetic block bar mark 2. Therefore, when a magnetic field is loaded onto the magnetic recording layer 4 of the bar code part 1, the part not to be covered with the magnetism block bar mark 2 is magnetized and the part covered with the magnetism block bar mark 2, however, is not magnetized. Namely, between the magnetism block bar marks 2, the signal area is formed to magnetically record signals, and at the part attached with the magnetism block bar mark 2, the no-signal area without any signals is formed. By combining these signal area and no-signal area, code information to be magnetically read can be constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium provided with a magnetically readable bar code provided for security purposes and the like.

[Prior Art] Conventionally, a magnetically readable magnetic bar code has been attached to magnetic recording media such as prepaid cards for security purposes. That is, a bar code is written on a magnetic recording medium using magnetic printing, and when the magnetic recording medium is used, the bar code is read with a magnetic head to determine whether there is any fraud such as forgery.

The magnetic barcode is formed by disposing magnetic bar marks 12 at predetermined intervals on the surface of a magnetic recording medium having a magnetic recording layer with a strong coercive force, as shown in FIG. This magnetic bar mark 12 is placed on the magnetic recording layer by magnetic printing using a low coercive force magnetic ink or the like. Therefore, if the portion with the magnetic bar mark 12 is magnetized by a magnetic head with low coercive force, only the magnetic bar mark 12 is magnetized as shown in the figure, forming a magnetic signal area and a non-signal area. This combination of magnetic signal area and non-signal area allows magnetically readable code information (for example, "0101001101
The code information on the magnetic bar mark 12 is usually written in advance at the manufacturing stage of the magnetic recording medium.

[Problems to be Solved by the Invention] By the way, a reading device that reads and writes data to and from a magnetic recording layer of a magnetic recording medium is usually equipped with a magnetic head having a high coercive force. If a magnetic bar code with a weak coercive force is read using a magnetic head with a high coercive force, there is a risk that the code information will be erased.

In addition, in order to avoid the above situation, it is necessary to provide a read/write device with a low coercive force magnetic head dedicated to reading magnetic barcodes, or to make it possible to adjust the level of coercive force of the A1 head. However, the disadvantage was that the configuration of the read/write device was complicated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks and to enclose a magnetically readable barcode in a magnetic recording medium without the risk of losing the magnetic signal during reading.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic recording medium having a magnetic recording layer for magnetically recording data, in which a barcode portion is provided on the magnetic recording layer, and the barcode portion is provided on the magnetic recording layer. Magnetic shielding bar marks made of magnetic shielding material are arranged at predetermined intervals in the code part, and the bar code part has a non-magnetized signal-free area above the magnetic shielding bar marks, and magnetizes the area between the magnetic shielding bar marks. It is characterized in that a magnetically readable barcode is formed by forming a signal area.

The invention set forth in item 2 is characterized in that, in the invention set forth in item 1, a magnetic shielding bar mark is attached to the barcode portion by printing using ink containing a magnetic shielding material.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the magnetic recording medium of the present invention.

In this embodiment, a case will be described in which a prepaid card is used as the magnetic recording medium.

The prepaid card 3 has a magnetic recording layer 4 that magnetically records data. The magnetic recording layer 4 is usually provided over the entire surface of the prepaid card 3. As shown in the figure, a part of the magnetic recording layer 4 is used as a strip-shaped recording area 5 for reading and writing data.

Further, the prepaid card 3 is provided with an 8-code section 1 as shown in FIG. A magnetic shielding bar mark 2 is printed on the barcode portion 1 using ink containing a magnetic shielding material.

FIG. 2 is a sectional view of the barcode section l.

As shown in the figure, in the barcode section 1, the magnetic recording layer 4
is partially covered by a magnetic shielding bar mark 2. As a result, when a magnetic field is applied to the magnetic recording layer 4 of the barcode part l, the part not covered by the magnetic shielding bar mark 2 will be magnetized, but the part covered by the magnetic shielding bar mark 2 will not be magnetized. . That is, the area between the magnetic shielding bar marks 2 forms a signal area in which signals are magnetically recorded, and the area to which the magnetic shielding bar marks 2 are attached forms a no-signal area in which no signal is present. The combination of the signal area and the no-signal area can constitute magnetically readable code information.For example, in the case of a magnetic shielding bar mark 2 as shown in Figure fS2, as shown in Figure 3 A signal area and a no-signal area are formed. Then, by reading the signal area as “1” and the no-signal area as “0” at regular intervals,
The code information "101001010" can be obtained by varying the width of the bar marks 2 (no signal area) and their mutual spacing (signal area).

Needless to say, a lot of code information can be defined.

Since code information is detected only by the presence or absence of a signal, it is completely unrelated to the waveform of the signal. Therefore, the signal can be used as specific data separate from code information. That is, a barcode section l for recording code information.
This means that magnetically recorded data can be superimposed on and old.

In this embodiment, the case where a prepaid card is used as the magnetic recording medium has been described above, but it goes without saying that other magnetic recording media can be similarly encapsulated with bar codes.

Further, the means for attaching the magnetic shielding bar mark 2 is not limited to printing using ink containing a magnetic shielding material, and may be attached by, for example, pasting a magnetic shielding material on the barcode portion l.

[Effects of the Invention] As explained above, the present invention provides a magnetic shielding bar mark that is arranged in the 8-code section provided on the magnetic recording layer, and that the magnetic shielding bar mark is set as a no-signal area. Since the barcode is formed with the signal area between the marks, there is no possibility that the magnetic signal will be erased even when read by a magnetic head that reads and writes data to the magnetic recording layer. Also, on the line of the barcode section,
It is possible to record data with the same intensity as the data written to the magnetic recording layer.

In addition, since the code information can be read using the magnetic head for reading and writing data, there is no need to provide magnetic heads with different coercive forces in the read/write device, or to be able to adjust the coercive force of the magnetic head, which simplifies the configuration of the read/write device. It is possible to aim for

The second aspect of the invention has the effect that the magnetic shielding bar mark is attached by printing using ink containing a magnetic shielding material, so that the work of attaching the magnetic shielding bar mark to the barcode part is facilitated.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a magnetic recording medium according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the barcode portion of FIG. 1, and FIG.
FIG. 4 is a diagram showing code information based on a magnetic barcode. l: Barcode section 2: Magnetic shielding bar mark 3: Prepaid card 4: Magnetic recording layer

Claims (2)

[Claims] (1) In a magnetic recording medium having a magnetic recording layer that magnetically records data, a barcode section is provided on the magnetic recording layer, and magnetic shielding bar marks made of a magnetic shielding material are placed on the barcode section at predetermined intervals. The barcode part is a magnetically readable barcode by forming a non-magnetized signal area on the magnetic shielding bar mark and magnetizing the space between the magnetic shielding bar marks to form a signal area. A magnetic recording medium characterized by forming. (2) The magnetic recording medium according to claim 1, wherein a magnetic shielding bar mark is attached to the barcode portion by printing using ink containing a magnetic shielding material.