JPS61248202A - Magnetic card - Google Patents

Abstract

PURPOSE:To prevent a magnetic card from abuse such as forgery and alteration by laminating a magnetic layer having high anti-magnetic force to store recording data and a magnetic layer having a low antimagnetic force to store interfering data on a substrate. CONSTITUTION:In the magnetic card, the high Hc magnetic layer 3 and the low Hc magnetic layer 4 are laminated on the plastic substrate 2. Real data are recorded on the magnetic layer 3 with recording current (y) and interfering data to prevent recorded contents from being read out are recorded on the magnetic layer 4 with recording current (x). Eve if the recorded data are to be simply read out under said constitution, the data recorded n the magnetic layers 3, 4 are interfered with each other and the meaningless contents can not be read out. When the real data recorded on the magnetic layer 3 are to be read out, it is necessary to erase the interfering data recorded on the layer 4 in series with the recording current (x). Consequently, the magnetic card can be surely prevented from abuse such as forgery and alteration due to transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic card applied to, for example, a cash card in a toll collection system.

[Problems to be solved by the prior art and the invention 1 Conventionally, the following types of magnetic cards have been adopted.

First, the unique information on the magnetic card is optically read, and the information is encoded and recorded on the magnetic layer. Then, during magnetic reading, the read information is compared with the above-mentioned card-specific information to detect a fake card.

A protective film is provided on the recording layer of a magnetic card to hide the recorded content, and the hidden recorded content is read by a magnetic head with a special gap.

Furthermore, there is a method in which the magnetic coating film of a magnetic card is patterned by applying a magnetic field orientation during coating, and the recorded contents are read out using a special head.

As described above, conventional magnetic cards have been devised in various ways to prevent counterfeiting, alteration, etc.

However, in the current situation where magnetic cards are widely used, it is necessary to more or less reliably prevent counterfeiting, falsification, and related accidents, and improvements in magnetic cards are required.

The present invention has been made based on the above points, and an object thereof is to provide a magnetic card that can reliably prevent misuse such as forgery and alteration.

[Means for Solving the Problems] That is, the magnetic card according to the present invention has a high coercive force magnetic layer for storing recorded data and a low coercive force magnetic layer for storing disturbance data stacked on a substrate. It is characterized by the fact that it has been formed.

[Function] In other words, the magnetic card has a multilayer structure consisting of a magnetic layer with high coercive force and a magnetic layer with low coercive force, and true data is recorded in the magnetic layer with high coercive force, and the magnetic layer with low coercive force When attempting to record interference data on a magnetic card, for example, the interference data interferes with the data on the device, making it unreadable.

[Effects of the Invention] Therefore, it is possible to reliably prevent misuse such as forgery and alteration due to transcription, and it is possible to provide a highly reliable magnetic card.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. indicates a plastic substrate. A Hi9h-HC magnetic layer 3 is placed on this plastic substrate 2, and a LOW-Hc magnetic layer 4 is placed roughly on top of it. It is a symbol that indicates magnetic force, r++enry”coerc
It is an abbreviation of ive-forceJ. Also rH19h
-HCJ is a magnetic material whose magnetization does not become zero unless a higher reverse magnetic field is applied, such as Ba0.6Fe.
There are 20 yo etc. Furthermore, the above-mentioned "LoW/HcJ" refers to magnetic materials such as γ/Fe2O3 whose magnetization becomes zero even when a relatively low inverse magnetic field is applied. The magnetic layer 4 exhibits a recording current-reproducing output voltage characteristic as shown in Fig. 2. Fig. 2 is a diagram showing the relationship between the two, with the horizontal axis representing the recording current and the vertical axis representing the reproducing output voltage. Deori, Hi9 again
The characteristics of the h-HC magnetic layer 3 and the characteristics of the 0W-)-10 magnetic layer 4 are synthesized and shown. The diagram indicated by symbol A is Hi9h-H
This is the characteristic of the C magnetic layer 3, and the diagram indicated by the symbol B is LOW-
These are the characteristics of the HC magnetic layer 4. As is clear from FIG. 2, the LOW/HC1a layer 4 can obtain the best output near the recording current X, while the Hi9h-H
The Cm layer 3 can obtain the best output at the recording current y, and is not affected by the recording current X. This embodiment utilizes such a difference in characteristics.

That is, by controlling the recording current, the above-mentioned High
h-Hcle layer 3e and Low-Hcle layer 4
Record any data in. This will be explained in detail below.

First, the true data is recorded in the High-HC magnetic layer 3 using the recording current y.
At the same time, recording current X is used to record disturbing data on the low-HC magnetic layer 4 to prevent continuous recording. With this configuration, if you want to simply read the recorded data, the High-Hc magnetic layer 3 and the LO
The data recorded on the W-)-IC magnetic layer 4 interfere with each other, making the data incomprehensible and unreadable. That is, H
When attempting to read true data recorded in the igh-Hc magnetic layer 3, 1-ow-Hcvi is set at a recording current of X.
It is necessary to DC erase the interference data recorded in i-characteristic@4.

Based on the above configuration, its operation will be explained with reference to FIG. FIG. 3 is a diagram showing the operation in the toll collection device in order of operation, and the mark @11 in the figure indicates a magnetic card entrance.a The magnetic card 1 is carried into the toll collection device through this magnetic card entrance 11. Ru.

When the magnetic card 1 is carried into the magnetic card entrance 11, a motor (not shown) of the card transport mechanism 12 is driven, and the magnetic card 1 is introduced into the apparatus by a transport belt (not shown). The introduced magnetic card 1 has the LOW-HC magnetic layer magnetic erasing mechanism 13 erase the interfering data recorded in advance to prevent reading. Next, High-H
The true data recorded in the High-Hc magnetic layer 3 is read out by the c magnetic layer magnetic reproducing mechanism 14 . The true data here is, for example, the remaining amount and other data. Then, the next remaining amount obtained by subtracting the used amount from this remaining amount is recorded in the Hi9h-HCI magnetic layer magnetic recording mechanism 15. The data recorded by the High-Hc magnetic layer magnetic recording mechanism 15 is confirmed by the High-Hc magnetic layer magnetic reproducing mechanism 16. Thereafter, the disturbance data is recorded by the disturbance data magnetic recording mechanism 17. After the recording of the disturbance data is completed, the magnetic card 1 is transferred to the card transport mechanism 2.
As a result, the card is transported out through the card exit 18. Of course, the magnetic card 1 taken out in this manner has true data recorded on its High-Hc magnetic layer 3, and interference data recorded on its LOW-HC magnetic layer 4. Therefore, even if an attempt is made to simply read the data for transfer or the like, the true data and the interference data interfere with each other, making it impossible to read the data.

According to this embodiment, the following effects can be achieved.

(1) It becomes possible to hide the true data recorded in the High-Hc magnetic layer 3 by the disturbing data recorded in the Low-Hc magnetic layer 4.

(2) Even if it is not transferred to another magnetic card, since the recording currents As a result, counterfeiting of magnetic cards can be reliably prevented. .

Hey, said magnetic card entrance 11. mki card exit 1B
, l-ow-HC1a property 1 m magnetic erasure 1 structure 13° disturbance data provided in the magnetic recording mechanism 17, respectively 1, ow-)
-1cl magnetic layer magnetic write head may be shared, and Hiqh-HC magnetic layer magnetic reproducing mechanism 14. High
-Hc magnetic layer Hi provided in each magnetic reproducing mechanism 116
Similarly, the qh-HC magnetic layer magnetic read head can also be shared.

Furthermore, in the above embodiment, the Low-Hc
Although the magnetic layer is rarely a single layer, it is not limited to this.
It is possible to have a multilayer structure, for example, by installing HioJh-Hc magnetic layers 4 on both sides of which real data is recorded, and
A configuration in which the iqh-HC magnetic layer 4 is sandwiched may also be used.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
The figure is a perspective view of the magnetic card, and the second figure is HioJh-H.
FIG. 3 is a diagram showing the recording current-reproduction output voltage characteristics of the c magnetic layer and the LOW-HC magnetic layer, and is a diagram for explaining the operation. 1...Magnetic card, 2...Plastic base, 3°
°. Hi c3h-Hcviltli, 4 ・L OW -
HCl layer. Applicant's Sub-Agent Patent Attorney Takehiko Suzue Figure 1 Figure 2 Kehada-ryu (mA)

Claims (1)

[Claims] A magnetic card characterized in that it is formed by laminating a high coercive force magnetic layer for storing recorded data and a low coercive force magnetic layer for storing disturbance data on a substrate.