JP2583222B2 - Magnetic card recording / reproducing method, recording apparatus and reproducing apparatus used therein - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technology for preventing unauthorized use of a magnetic card, and more particularly to a recording and reproducing technology for a magnetic card having one linear magnetic stripe. Things.

(Prior art) At present, various types of magnetic cards are used in various fields such as ID cards, credit cards, automatic withdrawal of savings and deposits, use of public telephones, use of vending machines, use of vending machines, use of game machines, time cards, etc. Is used in various ways,
Its range of use is increasingly expanding. JIS currently has two types of credit cards (one and three trucks).

Regarding the use of these magnetic cards, prevention of unauthorized use has become a major problem. In order to prevent unauthorized use, it is common to make the printed or embossed part difficult to forge,
There is a method of preventing magnetic recording and reproduction from being easily copied. The specific method of preventing fraudulent use of magnetic recording and reproduction differs depending on the recording / reproducing method of the card, and various complicated methods are conceivable. Further, a method of obtaining desired data by using decryption software by using a CPU with the reproduced code is conceivable, but it is difficult to prevent it when completely forged. Also, it is difficult to deal with all fraud with one measure. Therefore, it can be said that it is practical to take effective countermeasures depending on the respective forms of fraud.

(Problems to be Solved by the Invention) The simplest form of a magnetic card is to form a magnetic stripe (portion to which a magnetic material is applied) 2 in a band shape at a predetermined position on the card 1 as shown in FIG. And a recording track 3 slightly narrower than the width of the stripe. This format corresponds to type II specified in JIS B9560, 9561. In this type of magnetic card, as shown in FIG. 9, data is recorded almost completely over the width of the magnetic stripe 2 to form a recording track, and reproduction is performed in the width direction of the recorded recording track. The portion is scanned by a reproducing head. The portion scanned by the reproducing head is called a reproducing track 4. Therefore, after the portion of the stripe 2 is cut out, this is added to the straight line C-
C, and as shown in FIG. 10, a cardboard 5 of the size of a card is separately prepared, and the divided pseudo recording track 6 is attached to a predetermined information stripe position as described above. A magnetic card that can be reproduced can be a magnetic card in terms of only the magnetic effect. For example, when the recording track width is 6 mm and the reproduction track is 2 mm, three counterfeit cards can be formed from one card. By applying this technique, a plurality of counterfeit cards are created by using unused or remaining cards as seeds, and these are put into a change machine to defraud cash. If the counterfeit card made in this way is too thick to be inserted into the change machine, the recording track separated from the cardboard is flatly adhered with cellophane tape or the like. When optical detection is used in addition to magnetic detection, a disposable card is used instead of cardboard, and the appearance is cut and pasted in the same way as the real thing, and it is forged. This type of fraudulent use is often carried out in pachinko or game arcades.

SUMMARY OF THE INVENTION An object of the present invention is to record and reproduce a magnetic card which can easily and effectively prevent unauthorized use of reproducing and reproducing a plurality of counterfeit cards by cutting and pasting a magnetic card having one recording track in a straight line as described above. A method and a recording device and a reproducing device used for such a method are provided.

(Means for Solving the Problems) FIG. 1 is a conceptual diagram showing a basic configuration of a magnetic card recording / reproducing method according to the present invention. An output signal of a signal source 11 that generates information to be recorded on a magnetic card is supplied to a recording signal processing circuit 12 and divided into a plurality of data sections.
These signals are sent from a plurality of recording tracks 16-1 to 16-N on a magnetic recording stripe 15 provided at predetermined positions on a magnetic card 14 by a plurality of recording magnetic heads 13-1 to 13-N. Recording is performed on an alternately selected recording track. Recording tracks 16-1 to 16 on magnetic card 14
17-1-1 --- 17-2-1
---, 17-N-1 ---- In reproduction, a signal obtained by scanning each of the plurality of recording tracks 16-1 to 16-N on the magnetic card 14 by each of the plurality of reproducing magnetic heads 18-1 to 18-N is used as a signal processing circuit for reproduction. The signal is supplied to the data section 19, and the reproduced signal processing circuit 19 combines the signals in the data section 17-1-1 to reproduce the original information.

(Operation) In the above-described magnetic card recording / reproducing method according to the present invention, information is divided into a plurality of data sections, and these data sections are divided into a plurality of recording tracks 16-1 to 16
Since recording was performed on a recording track that was alternatively selected from -N, if such a recording track was divided in the longitudinal direction, it would be meaningless as information, and this divided magnetic strip was attached to a card and forged. However, no significant information is reproduced, and illegal use is no longer possible.

In the present invention, the number of the recording tracks 16-1 to 16-N may be two or more. In particular, the number of the recording tracks 16-1 to 16-N is two, and the data section is recorded in a zigzag manner and the direction of the gap of each recording head is changed in the scanning direction. It is preferable to incline somewhat in the opposite direction alternately with respect to the direction orthogonal to.

(Embodiment) FIG. 2 is a circuit diagram showing a configuration of a recording apparatus in an embodiment of a recording / reproducing method of a magnetic card according to the present invention, and FIG. 3 is a circuit diagram showing a configuration of the reproducing apparatus. In this example, two recording magnetic heads 21-1 and 21-2 are provided, and data sections are alternately recorded on two recording tracks. Data to be recorded is supplied from an input terminal 22 to a modulator 23. The modulator 23 is also supplied with a clock of a predetermined frequency from an input terminal 24 to convert data to be recorded into a digital code. This digitally encoded signal is the first
And to the second drive circuits 25-1 and 25-2 in parallel. These first and second drive circuits 25-1, 25-
2 is supplied with a recording control signal from a terminal 26 and a terminal
Flip-flop driven by switching signal from 27
It provides 28 Q output signals and Q output signals, respectively.

4A shows the recording data supplied to the input terminal 22, FIG. 4B shows the switching signal supplied to the input terminal 27, and FIG. 4C shows the recording control signal supplied to the input terminal 26. Show. The first and second driver circuits 25-1 and 25-2 become operable when the recording control signal is at the logical "L" level. On the other hand, when the switching signal changes from "H" to "L", the Q output of the flip-flop 28 becomes "L" and the Q output becomes "H", the first drive circuit 25-1 operates, and the modulator 23 outputs Is supplied to the first recording magnetic head 21-1 via the first drive circuit 25-1, and the first data signal is recorded on the first recording track 29-1 of the magnetic card as shown in FIG. 4D.
Is recorded in the data section 30-1-1. Next, when the switching signal switches from “L” to “H”, the flip-flop
The Q output of the modulator 23 becomes “H”, the Q output becomes “L”,
Is supplied to a second recording magnetic head 21-2 via a second drive circuit 25-2, and a second data section is recorded on a second recording track 29-2 as shown in FIG. 4E. 30-2-1 is recorded. As described above, each time the switching signal changes from "H" to "L" and from "L" to "H", the data signal from the modulator 23 is transmitted through the first and second driver circuits 25-1 and 25-2. Are supplied alternately to the first and second recording magnetic heads 21-1 and 21-2, and are supplied to the data sections 30-1-1, 30-2-1 and 30- as shown in FIGS.
1-2,30-2-2 ---- has two recording tracks 29-1,29-
2 is recorded in a zigzag manner.

As shown in FIG. 3, the reproducing apparatus includes first and second reproducing magnetic heads 31-1, 31-2, and supplies output signals of these magnetic heads to demodulators 31-1, 31-2, respectively. The demodulated signals are combined in the OR circuit 33 and output to the output terminal 34. 5A and 5B are reproduced by the first and second reproducing magnetic heads 31-1, 31-2, and the first and second demodulators 32 are used.
Data section 30-1-1,30 demodulated by -1,32-2
2-1 and 30-1-2 ----. When these signals are passed through the OR circuit 33, as shown in FIG. 5C, the sequential data sections 30-1-1, 30-2-1, 30-1--
A data signal in which 2,30-2-2, 30-1--3, 30-2--3 ---- are arranged in a predetermined sequence is obtained.

FIG. 6 shows recording tracks recorded as described above, and two recording tracks 43-1 and 43-2 are formed on a magnetic stripe 42 provided at a predetermined position of a magnetic card 41. The signals of the data sections 30-1-1 and 30-2-1-- are recorded on these recording tracks in a zigzag manner. In this example, the recording magnetic heads 21-1 and 21-2 are used.
The direction of the gap between the reproducing magnetic heads 31-1 and 31-2 is not perpendicular to the longitudinal direction of the recording track, but is inclined in directions opposite to each other by an angle of about ± 5 °. With such an inclination, it is difficult to obtain a good signal even when reproducing with a normal reproducing head for an unauthorized use.

As described above, the information to be described is divided into a plurality of data sections 30-1-1 and 30-2-1.
In order to reproduce the original information by re-arranging these data sections upon reproduction, the magnetic stripe 42 was cut off from the card 41 and read in the longitudinal direction. If the information is divided into a plurality of pieces, the information can no longer be correctly reproduced, so that unauthorized use can be effectively prevented.

The present invention is not limited to the embodiments described above,
Many modifications and variations are possible. For example, in the above-described embodiment, the data sections are recorded in a zigzag manner on two recording tracks, but the division method is arbitrary. For example, as shown in FIG. 30-2, and may be recorded on the first and second recording tracks 29-1 and 29-2, respectively.

(Effects of the Invention) As described above, according to the present invention, data is divided into a plurality of data sections and these are recorded on a track selected from a plurality of tracks.
It is itself difficult to cut and paste to create several counterfeit cards as in a book truck. Even if it is created, the data is dispersed and recorded, so that it is more difficult to read. Further, since the recording is made oblique, it is difficult to read the data unless the head is at an oblique angle. For this reason, it is almost impossible to fraudulent change by fraudulent means. Further, the recording device and the reproducing device of the present invention are extremely simple, and the effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a basic configuration of a recording / reproducing method of a magnetic card according to the present invention, FIG. 2 is a circuit diagram showing a configuration of an embodiment of a recording apparatus of the present invention, and FIG. 4A to 4E are signal waveform diagrams for explaining the operation of the recording apparatus shown in FIG. 2, and FIGS. 5A to 5C are shown in FIG. FIG. 6 is a signal waveform diagram for explaining the operation of the reproducing apparatus, FIG. 6 is a diagram showing a pattern of a data section recorded by the recording apparatus shown in FIG. 2, and FIG. 7 is a modification of a recording pattern of the data section according to the present invention. FIG. 8 is a plan view showing an example of the configuration of a magnetic card. FIG. 9 is a diagram showing recording tracks recorded by a conventional recording method. FIG. 10 is a diagram showing a conventional recording track. FIG. 4 is a diagram showing a method of forming a forged magnetic card by performing the method. 11 ... Signal source, 12 ... Recording signal processing circuit 13-1 to 13-N ... Recording magnetic head 14 ... Magnetic card 16-1 to 16-N ... Recording track 17-1-1 ---- 17-N-1 Data section 18-1 to 18-N Reproducing magnetic head 19 Reproducing signal processing circuit 21-1, 21-2 Recording magnetic head 23 Modulator 25-1, 25-2 First and second drive circuits 28 Flip-flops 29-1, 29-2 First and second recording tracks 30-1-1, 30-2-2 ---- Data section 31-1, 31-2 Reproducing magnetic head 32-1, 32-2 Demodulator 33 OR circuit 41 Magnetic card 42 Magnetic stripe 43-1, 43-2 Recording track

Claims (4)

(57) [Claims] In recording, information to be recorded is divided into a plurality of data sections, and signals of these data sections are recorded by selectively selecting a plurality of recording tracks on a magnetic card by a plurality of recording heads. Upon reproduction, a plurality of recording tracks on the magnetic card are scanned by a plurality of reproduction magnetic heads, and reproduction signals obtained from the plurality of reproduction heads are combined to reproduce original information. Recording / playback method for magnetic cards. A plurality of recording magnetic heads for recording a signal on each of a plurality of parallel magnetic tracks on a magnetic card; information to be recorded divided into a plurality of data sections; A recording signal processing circuit for supplying to a recording magnetic head alternatively selected from the plurality of recording magnetic heads and recording on a recording track selectively selected from the plurality of recording tracks. Characteristic recording device for magnetic card. 3. A configuration in which two recording magnetic heads are provided, a data section signal is alternately supplied to these recording magnetic heads, and recording is performed on two recording tracks in a zigzag manner. 3. The magnetic card recording apparatus according to claim 2, wherein the gap is arranged to be inclined with respect to a direction perpendicular to the longitudinal direction of the magnetic track. 4. Dividing information into a plurality of data sections;
Each of the plurality of recording tracks is scanned by an apparatus for reproducing original information from a magnetic card in which signals of these data sections are recorded on a recording track selected from a plurality of recording tracks by a plurality of recording heads. A reproducing apparatus for a magnetic card, comprising: a plurality of reproducing magnetic heads; and a reproducing signal processing circuit for reproducing original information by synthesizing reproducing signals from the plurality of reproducing magnetic heads.