JPH0568781B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a security method in a magnetic card usage system, and in particular, to write synchronization information modulated with a specific signal on the magnetic stripe of a magnetic card, and at least write synchronization information based on this synchronization information. The present invention relates to a security method in a magnetic card usage system that writes value information on another magnetic stripe and enables reproduction of the value information when the synchronization signal and the specific signal are present, thereby ensuring safety in the use of the magnetic card.

[Prior Art] Systems for making payments using magnetic cards are used in various fields, such as ticket vending machines for transportation facilities, card-type public telephones, and game machines.
In such a magnetic card usage system, a user pays a certain amount of money to a service provider in advance, receives a magnetic card with value information written on it, and thereafter, each time a service is provided, the value information of the magnetic card is reduced. This is a system that allows you to pay for your card and use it at any time until the value information on your magnetic card reaches zero.

Such a magnetic card usage system has the advantage that there is no need to prepare cash each time the card is used, and it is easy to handle.

[Problem that the invention seeks to solve]

By the way, as the above-described magnetic card usage system has become widespread, situations have arisen in which magnetic cards are used illegally. This is mainly carried out by writing value information in a predetermined manner onto a new magnetic card on which no value information has been written, and then using this magnetic card. Therefore,
Measures against such unauthorized use have been desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a security system for a magnetic card usage system that solves the above-mentioned problems and ensures proper usage of magnetic cards.

[Means for solving problems]

The present invention solves the above-mentioned problems, and when a service is provided using a magnetic card having a magnetic recording medium on which value information is written, the payment is made.
and a magnetic card usage system that reduces the value information of the magnetic recording medium each time a payment is made and allows the use of the magnetic card until the value information becomes zero, the magnetic card having a magnetic record in which synchronization information can be written. By providing a medium and writing synchronization information modulated with a specific symbol on the magnetic recording medium, it is possible to write value information and other information only when there is at least synchronization information, and when there is synchronization information and a specific signal. The feature is that only value information and other information can be read out.

[Effect]

It is assumed that the magnetic recording medium of the magnetic card is provided with an area where value information and other necessary information can be written, and an area where synchronization information can be written. Synchronization information modulated with a specific signal is written in one of the magnetic recording media of the magnetic card, for example, before shipment from the factory.

When writing value information and other necessary information to the other magnetic recording medium of the magnetic card, the writing can be done only when the magnetic recording medium has synchronization information.

When using a magnetic card, value information and other information can be read only when there is a magnetic recording medium, synchronization information, and a specific signal. Further, when the value information is reduced when the payment of the price is completed, it is also written on the condition that the above-mentioned synchronization information is present.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

First Embodiment FIG. 1 is a diagram showing a magnetic card used in an embodiment of the present invention. This magnetic card 1 is a flexible one made of thin plastic or paper. Two magnetic stripes 2 and 3 are provided in the longitudinal direction as a magnetic recording medium coated with a magnetic material with a width of about 1/10 of the card surface, and one of the magnetic stripes 3 has a first magnetic stripe.
As shown in the figure, synchronization information such as a timing clock modulated with a specific signal such as a sine wave, rectangular wave, or triangular wave is written in the factory where the magnetic card 1 was manufactured, and the other magnetic stripe 2 is 1st
There is no writing as shown in the figure. This writing will be described later. On the surface of the magnetic card 1 other than the magnetic stripes 2 and 3, there is a punch hole area for visually checking the remaining number of times, and the number of remaining times is printed on the area, and on other parts, there is a computer game card, the name of the issuer, and the number of remaining times. The amount sold is printed.
Such magnetic cards are delivered from a factory to a service provider such as a game center.

FIG. 2 is a block diagram showing the configuration of a synchronous information etc. writing device for writing synchronous information etc. on the magnetic stripe 3 of the magnetic card 1 provided by a supplier etc. A take-out mechanism 5 that can take out only one sheet of paper 1 is provided, and at the bottom of this take-out mechanism 5 there are rollers 6,
A belt 8 is provided extending between the rollers 7 and 7, and a pair of rollers 9 are provided on the left side of the roller 6 in the drawing. Further to the pair of rollers 9, on the left side in the figure, a pair of rollers 1 is placed at a certain interval.
0 is provided between the rollers 9 and 10, and an optical reading type card detector 11 and a timing clock (which is modulated by a specific signal such as a sine wave or rectangular wave) on the magnetic stripe 3 of the magnetic card 1 are provided between the rollers 9 and 10. A magnetic head 12 for writing synchronization information) is provided. Each pair of rollers 9, 10 is a driving roller and a driven roller, and each pair of rollers 9, 10 is a driving roller and a driven roller.
The driving side rollers of the belt 8 are driven by a motor 13, and the rollers 6 of the belt 8 are also driven by the motor 13. The motor 13 is controlled by a control circuit 14. Further, a rotation detector 15 is connected to the rotation shaft of the driven roller of the pair of rollers 10, so that a rotation detection signal corresponding to the rotation of the roller can be extracted. The detection signal from the rotation detector 15 is sent to a signal generation circuit 1 that generates a specific signal.
6 and the control circuit 14. The signal generation circuit 16 is a circuit that can output a specific signal such as a sine wave, rectangular wave, or triangular wave with a constant period in synchronization with the rotation detection signal from the rotation detector 15, and the specific signal is transmitted to the modulation circuit 1.
It is connected so that it can be supplied to 7. A clock generation circuit 18 that generates a timing clock is connected to the modulation circuit 17, and this modulation circuit 17 modulates the timing clock from the clock generation circuit 18 with a specific signal from the signal generation circuit 16. This is output to the magnetic head 12. In addition, the signal generation circuit 16 and the modulation circuit 1
The operation of 7 is controlled by a control circuit 14. Similarly, the control circuit 14 controls the take-out mechanism 5
In addition to controlling the operation of the motor 13, the rotation of the motor 13 can also be controlled.

FIG. 3 is a perspective view showing a magnetic card issuing machine installed by a service provider, which is used in an embodiment of the present invention. It has a storage section for storing the card 1, and has an insertion slot 21 for inserting banknotes on the front side thereof, and a display device 22 for displaying the amount of the inserted banknotes. An issue button 23 and a cancel button 24 are provided, and a tray 25 for receiving the issued magnetic card 1' is provided below the issue button 23 and cancel button 24, respectively.

FIG. 4 is a diagram showing an outline of the signal processing section of the magnetic card issuing machine used in the embodiment of the present invention. is displayed on the display device 22, and when the magnetic card issuing button 23 is pressed, the denomination and issuing command are given to the magnetic card issuing processing circuit 31, and when the cancel button 24 is pressed, the cancel processing is performed. be.

On the other hand, near the card exit of the tray 25, a pair of rollers 32 and 33 are provided above and below in the figure. roller 3
4 and 35 are provided at the top and bottom in the figure, and further a pair of rollers 36 and 37 are arranged at the top and bottom in the figure with a certain interval between them. A spanning conveyor belt 40 is provided. Above the conveyor belt 40 in the figure, there is provided a take-out mechanism 41 that takes out only one magnetic card 1 when a take-out command is input, and above this take-out mechanism 41 there is a storage section that stores the magnetic cards 1, 1, . . . 42 is provided. The storage section 42 and the take-out mechanism 41 are provided for each denomination, and a conveyor belt 40 is extended below the take-out mechanism 41. roller 3
A card detector 43 is provided between the rollers 4 and 35 and the rollers 36 and 37.
33 and the rollers 34 and 35 are a read-only magnetic head 44 for reading synchronization information such as the timing clock of the magnetic stripe 3, a write-only magnetic head 45 for writing value information and other necessary information,
A card detector 46 is provided.

Detection signals from the card detectors 43 and 46 are input to a magnetic card issuing processing circuit 31 consisting of a microcomputer system. Similarly, a signal from the read-only magnetic head 44 is input to the magnetic card issuing processing circuit 31. Each control command signal from the magnetic card issuing processing circuit 31 is given to a motor 47 that drives the rollers 32 to 37 and a take-out mechanism 41, and the magnetic card issuing processing circuit 31
A write signal from the magnetic head 45 is applied to a write-only magnetic head 45.

FIG. 5 is a diagram showing a magnetic card 1' issued by a magnetic card issuing machine, and a data format is schematically shown in the diagram on the magnetic stripe 2' of the magnetic card 1'. In this data format, the writing order is "STX",
"Issuing company name code", "remaining number code", and "ETX" are recorded. "STX" indicates the reading start direction, "Issuing company name code" is a predetermined code with the name of the company that issued it, and "Remaining number code" is a code that is worth the number of times equivalent to the printed amount at the time of issue. Each information is recorded in a code,
"ETX" indicates the end of reading. Incidentally, the magnetic stripe 2' is provided with a blank portion, and the blank portion can be used as required.

FIG. 6 is a diagram showing a card type game machine according to an embodiment of the present invention, and the card type game machine 50 has a housing 51.
has a table-shaped exterior, and a display surface of a CRT display 52 is provided on the top surface of this housing 51.
In addition, the upper surface is covered with a transparent plate 53 that protects the CRT display 52, and an operation panel 54 is provided on one side of the housing 51, and the operation panel 54 includes buttons 55 for start and operation necessary for operation. A cancel/game selection button 56 and a joy stick 57 are provided, a card insertion slot 58 is provided on the right side of the operation panel 54 in the figure, and a magnetic card 1' is provided with magnetic stripes 2' and 3 in the card insertion slot 58. is inserted into the card-type game machine 50 to enjoy the game.

FIG. 7 shows a card reading/writing device 60 provided inside the card game machine 50.
Near the card insertion slot 58, a pair of rollers 61, 62 are provided above and below in the figure, and with respect to the pair of rollers 61, 62, a pair of rollers 63, 64 are provided at a constant interval on the opposite side of the card insertion slot 58. are arranged above and below in the figure, and a pair of rollers 65 and 66 are further arranged at a constant interval on the opposite side of the card insertion slot 58 to this pair of rollers 64 and 66, and these The rollers are placed on the same horizontal line. A card detector 6 is inserted between the rollers 61 and 62 and the rollers 63 and 64 from the card insertion slot 58 side.
7, a read-only magnetic head 68, and a read/write magnetic head 69. roller 6
A card detector 71 is provided on the opposite side of the cards 5 and 66 (the side opposite to the card insertion slot 58).

The detection signals from the card detectors 67, 71 are sent to a control circuit 70 consisting of a microcomputer system.
It is configured so that it is entered in Similarly, read/
The signal from the write magnetic head 69 is input to the control circuit 70 in the same manner as described above. The signal from the read-only magnetic head 68 is sent to the waveform shaping circuit 7.
2, the synchronization information D1 and the signal D2 formed based on the specific signal are separated and supplied to the control circuit 70, respectively. Each control output from the control circuit 70 is connected to a read/write magnetic head 69;
and the motor 73 that drives the rollers 61 to 66, respectively, and the card type game machine 50.
It is arranged so that it can be supplied to the game circuit 74 on the side.

The card detectors 67, 71 consist of light emitting parts 67a, 71a that emit light, and optical sensor parts 67b, 71b that receive light from the light emitting parts 67a, 71a. ′
This makes it possible to detect.

On the other hand, to the right of the rollers 65 and 66 in the figure, a pair of rollers 76 and 77 are placed above and below the figure at a certain interval.
are arranged, and these pair of rollers 76, 7
7, a pair of rollers 78 and 79 are further disposed on the upper and lower sides of the figure at a predetermined interval to the right in the figure, and a permanent magnet (or electromagnet) 80 is placed between these rollers 76 and 77 and rollers 78 and 79. At least the magnetic stripes 2, 2 and 3 are provided with an interval that allows the magnetic card 1' to pass through the permanent magnet 80.
A limit switch 82 is provided at a predetermined interval (slightly less than the longitudinal length of the magnetic card 1') to the right of these rollers 78 and 79 in the figure, and the limit switch 82 is controlled. It is connected to the circuit 70.

Note that a punch mechanism for punching a predetermined hole in the magnetic card 1' when the fee is reduced is omitted. Also,
The motor 37 is configured to drive any of the rollers 61 to 66, 76 to 79, the rollers 61, 63, 65, 76, 78, or the rollers 62, 64, 66, 77, 79. It is designed to be able to rotate forward or reverse depending on the control drive signal.

FIG. 8 is a block diagram showing an example of the circuit configuration of the waveform shaping circuit 72. An amplifier 83 is provided to amplify the signal from the read-only magnetic head 68, and the output from this amplifier 83 is sent to a limiter 84 and a wave detector. 85. Limituta 8
4 deletes signals above a certain level and creates a synchronization signal D
This is a circuit that forms 1. Further, the detector 85 is
This circuit extracts a specific signal from the signal from the amplifier 83, and is configured to be able to supply this specific signal to one input terminal of the comparator 86. Comparator 86
compares the reference value supplied to the other input terminal with the specific signal, and forms a signal D2 that becomes "1" when the specific signal is larger than the reference value, and "0" when it is smaller. This is a circuit that does this.

The operation of such an embodiment will be explained.

<Writing operation of synchronous information, etc.> The writing operation of synchronous information, etc. will be explained with reference to FIGS. 1, 2, 9, and 10.

The control circuit 14 issues a command to the ejecting mechanism 5 to eject only one magnetic card 1, and at the same time drives the motor 13 (step S100). Then,
The magnetic card 1 stored in the storage section 4 is dropped onto the belt 8. The magnetic card 1 is conveyed on a belt 8, sandwiched between a pair of rollers 9, and further conveyed. When the leading edge of the magnetic card 1 is detected by the card detector 11 (step S101), the modulation circuit 1
7 and the signal generation circuit 16 are activated (step S
102). Then, as shown in FIG. 9B, the signal generation circuit 16 outputs a signal synchronized with the rotation of the roller 10, and is added to the modulation circuit 17 (step S103). A signal as shown in FIG. 9A is outputted from the clock generation circuit 18 and supplied to the modulation circuit 17. The modulation circuit 17 modulates the clock signal (FIG. 9 [A]) with a specific signal (FIG. 9 [B]), supplies the signal shown in FIG. 9 C to the magnetic head 12, and converts this signal into a magnetic head. The magnetic stripe 3 of the card 1 is written (step S104).
Next, steps S105 and S104 are performed until the card detector 11 detects the rear end of the magnetic card 1.
is repeated, but in step S105 magnetic card 1 is
When the trailing edge is detected, the process moves to step S106, and it is determined whether a predetermined number of sheets have been printed (step S106).
106). In step S106, if the recording of all the magnetic cards 1 has not been completed, the process proceeds to step S106.
The process moves to step 100, but if the total number of sheets has been completed in step S106, the process moves to step S107, and the motor 13, signal generation circuit 16, and modulation circuit 17 are stopped.

As a result, the magnetic stripe 3 of the magnetic card 1
As shown in FIG. 9, the amplitude of the timing clock is distributed and recorded in a state where it fluctuates in the major axis direction. In this state, the product is supplied from the manufacturer to the service provider.

<Magnetic Card Issuance> First, the operation of issuing a magnetic card in which value information is written to the magnetic card 1 will be described with reference to FIG.

FIG. 11 is a flowchart for inventing a magnetic card issuing operation. A banknote is inserted into the insertion slot 21 of the magnetic card issuing machine 20. (Step S200). The banknote processing mechanism 30 takes in banknotes from the insertion slot 21, determines the denomination, and displays the banknotes on the display device 22.
(Step S201). Next, the banknote processing mechanism 30 determines whether the magnetic card issuing button 23 or the cancel button 24 is pressed (step S202), and when the cancel button is pressed, the banknote processing mechanism 30 inserts the banknote. Mouth 2
1 (step S203), and the process ends.
When it is determined in step S202 that the magnetic card issue button 23 has been pressed, the banknote processing mechanism 30 gives the "denomination" and "issuance command" to the magnetic card issue processing circuit 31 (step S204).
The magnetic card issue processing circuit 31 drives the motor 47 and gives a command to take out the magnetic card 1 of the denomination to the take-out mechanism 41 (step S205). Removal mechanism 41 given command
takes out only one magnetic card 1 from the storage section 42, places it on the conveyor belt 40, and conveys it to the rollers 36, 37 by the conveyor belt 40 (step S206). When the magnetic card 1 is moved to the left in the figure by the rollers 36 and 37 and detected by the card detector 43 (step S207), it becomes ready for writing. After the magnetic card 1 is detected by the card detector 43, the read-only magnetic head 4
4, the timing lock is read from the magnetic stripe 3 of the magnetic card 1 (step S2).
08), necessary information and value information are written on the magnetic stripe 2 of the magnetic card 1 via this write-only magnetic head 45 (step S209).
When the writing to the magnetic card 1 is completed, a notification to that effect is sent from the magnetic card issuing processing circuit 31 to the banknote processing mechanism 3.
0 (step S210). As a result, the magnetic card 1 becomes a magnetic card 1' on which necessary information is written. Next, when the end of the magnetic card 1' is detected by the card detector 46 (step S21
1) After a certain period of time has elapsed, the motor 47 is stopped (step S212). As a result, the saucer 25
Then, a magnetic card 1' shown in FIG. 5 on which necessary information has been written is ejected. This magnetic card 1' is issued to the user. Incidentally, if there is no synchronization information in step S208, the process is terminated and the magnetic card 1' is stored in a predetermined location within the magnetic card issuing machine 20.

<Utilization of Magnetic Card> FIG. 12 is a flowchart shown to explain the operation of the embodiment of the present invention.

The magnetic card 1' issued by the magnetic card issuing machine 20 is inserted into the card insertion slot 58 of the card game machine 50, as shown in FIG. 6 (step S300). When the magnetic card 1' is sandwiched between the rollers 61 and 62 and further inserted into the card detector 67, light from the optical sensor section 67b of the card detector 67 is blocked by the magnetic card 1'. As a result, the magnetic card 1' can be detected (step S301). Then, the card detector 67
The detection signal of the magnetic card 1' is supplied to the control circuit 70 from the motor 7.
3 rotates the rollers 61 to 66 and sends the magnetic card 1' to the right in the figure (step S302). The magnetic card 1' has rollers 61, 6
2. When passing through the rollers 63, 64 and rollers 65, 66, the magnetic stripe 3 portion is placed on the read-only magnetic head 68 provided between the rollers 61, 63, and the magnetic stripe is placed on the read/write magnetic head 69. The timing clock written on the magnetic stripe 3 with the two portions in sliding contact is read out (step S303). The signals read out from the magnetic stripe 3 via the read-only magnetic head 68 are as shown in FIG. 13a. This is applied to the amplifier 8 of the waveform shaping circuit 72.
3 and amplify it. The output signal of amplifier 83 is also similar to that in FIG. 13a. This output signal is supplied to a limiter 84 and a detector 85. Limita 84
separates the timing clock D1 as shown in FIG. 13b from the signal (FIG. 13(a)). The detector 85 detects the signal shown in FIG. 13c from the signal shown in FIG. 13d.
A signal shown in is obtained and supplied to the comparator 86. The comparator 86 compares the signal of FIG. 13c with the reference value Es,
When the signal (FIG. 13 [c]) is larger than the reference value Es, it outputs "1", and at other times it outputs "0". The output signal of this comparator 86 is
The signal is shown in FIG. 12d.

When the signals D1 and D2 from the waveform shaping circuit 72 are detected (step S303), the magnetic stripe 2' is adjusted based on the timing clock D1.
At the same time, the signal D2 from the waveform shaping circuit 72 is read and temporarily stored in the registers in the control circuit 70 (step S303). Note that the signal D2 is added to the register. Magnetic card 1' is on rollers 65, 66
When the end of the magnetic card 1' is detected by the card detector 71, a signal is supplied from the card detector 71 to the control circuit 70, and the control circuit 70 starts the motor 73. It is stopped (step S305). The control circuit 70 is
It is determined whether the "issuer name code" temporarily stored in the register belongs to the company and whether the signal D2 is counted by a predetermined number (step S).
306), if the number belongs to the company and the signal D2 is a predetermined number, it is determined whether there is any remaining number in the "remaining number code" (step S307). In the case of the example,
As shown in FIG. 5, since a magnetic card 1' issued by the company and never used has been inserted, steps S300 to S30 are performed.
It will be processed in steps 7.

If there is any remaining code in the "remaining number code" temporarily stored in the register in step S307, the control circuit 7
If the "remaining number of times" is stored in the storage area M of the storage device in 0 and the register is cleared (step S
308).

Next, the use determination flag F in the control circuit 70 is set to "0" (step S309). The control circuit 70 issues a game enable command to the game circuit 74 (step S310). The control circuit 70 then waits to see if a game start signal is input (step S311) or a cancel signal is input (step S312). on the other hand,
The game circuit 74 displays on the CRT display 52 that the game can be used. Here, when the user starts the game, a use start signal is supplied from the game circuit 74 to the control circuit 70, so that the control circuit 70 stores the contents of the storage area N (initially) for determining the number of times the game has been used. "1" is added to "0"), and the addition result is stored again in the storage area N (step S313). Next, in order to determine the state of use, flag F is set to "1" (step S314). Next, the game circuit 7
When the control circuit 70 receives the game end signal from 4 (step S315), the control circuit 70 subtracts the contents of the area N from the contents of the storage area M, and determines whether the subtraction result is zero ( Step S316), if not zero, step S310 again
Return to

In the case of the embodiment, it is assumed that the magnetic card 1' that has never been used is inserted into the card game machine 50 and the game is played three times in a row.
00-S309, steps S310-S3
This means that 16 has been repeated three times. Therefore, it is clear that area M is "10" and area N is "3".

Next, when the user presses the selection button 56 of the card game machine 50 and a cancel signal is supplied from the game circuit 74 to the control circuit 70, the control circuit 70 sets the use determination flag F to "1". ”
is set (step S31)
7). Since flag F is set when card type game machine 50 is used even once, in this case, control circuit 70 moves to step S318. That is, by driving the motor 73, the roller 61
-66 is rotated to move the magnetic card 1' to the left in the figure (step S318). When the magnetic card 1' moves to the specified position, a timing clock D is placed on the magnetic stripe 3 of the magnetic card 1'.
1 (step S319), the control circuit 70 provides the read/write magnetic head 69 with the result of subtracting the contents of the storage area N from the contents of the storage area M to write a new remaining number of times on the magnetic stripe 2'. is stored (step S320). Further, when the magnetic card 1' reaches a specified position, the control circuit 70 controls the solenoid and motor 73 of the punching mechanism (not shown) to punch holes at positions corresponding to the contents of the storage area M and the storage area N. A command is given to punch a hole at a predetermined position in the magnetic card 1' (step S321).
In the case of this embodiment, the card-type game machine 50 was used three times using the magnetic card 1' that was never used, so naturally the punch holes were punched at the beginning (remaining number of times "10").
Three pieces are opened from the part. In other words, punch holes will be punched at the remaining number of times "10", "9", and "8".

Next, when the magnetic card 1' is detected by the card detector 67 (step S322), the end of the magnetic card 1' opposite to the card insertion slot 58 is detected by the card detector 67 (step S323). ), when this is detected, the control circuit 70
stops driving the motor 73 (step S32).
4). About half of the magnetic card 1' protrudes from the card insertion slot 58. In addition, since the game was played three times using magnetic card 1' that was never used, three punch holes P ("10", "9", and "8") were partially punched for magnetic card 1'. It will be done.

Then, the storage areas M and N are cleared (step S325), and the series of processing ends.

On the other hand, in step S303, it is determined that there is no timing clock D1, and in step S306, the control circuit 70 determines that the card is issued by another company and the signal D2 is a specified number, or in step S319, the control circuit 70 determines that the timing clock D1 is not present.
If there is no timing clock D1, the control circuit 70
If so, the process moves to step S326. That is, in step S326, the control circuit 7
0, the motor 73 is driven to reversely rotate the rollers 61 to 79 to transport the magnetic card 1' to the card insertion slot 58 side, and then the process moves to step S322 to perform the subsequent series of processes. .

Further, in step S316, the control circuit 7
0, when it is determined that the result of subtracting the contents of storage area N from the contents of storage area M is zero, or when it is determined by control circuit 70 that there is no remaining number of times set in the register in step S307. , from the control circuit 70 to the game circuit 74
is given an instruction to "display unusable" (step S34).
0), and the control circuit 70 drives the motor 73 to rotate the rollers 61 to 66 in the forward direction to rotate the magnetic card 1'.
is sent in the direction of the rollers 76, 78 and passed between the permanent magnet 80 and the iron plate 81 (step S34).
1) This operation is continued until the limit switch 82 detects the end of the card 1' (step S342).
Let it continue. Next, the process moves to step S318, and a series of subsequent processes are performed. By passing the magnetic card 1' between the permanent magnet 80 and the iron plate 81 in this way, the recorded contents of the magnetic stripes 2 and 3 are erased.

In addition, once the magnetic card 1' is inserted into the card insertion slot 58,
When the cancel button of the selection button 56 is pressed after inserting the
~ After S312 is processed, step S317
In step S317, since F=0 in this case, the process moves to step S230. In this embodiment described above, a magnetic card 1' is used, which is inserted into the card slot 58 of the card game machine 50, and after the game is completed, the card is ejected from the card slot 58 again. However, the present invention is not limited to this, and it is also possible to use a type in which the insertion port and the discharge port are separate.

In addition, the magnetic heads 44, 45 and the magnetic head 6
8 and 69 are shown arranged on the left and right sides in the figure, but these are arranged perpendicularly to the plane of the paper.
In addition, the magnetic heads 44, 45, or the magnetic head 6
8 and 69 are shown separately, but the magnetic heads 44,
45 or magnetic heads 68, 6.
9 may be integrally formed.

In the above embodiment, when there is a timing clock on the magnetic stripe 3 of the magnetic card 1, necessary information is written and a magnetic card 1' is issued, and when the issued magnetic card 1' is used, the magnetic stripe 3 The value information of the magnetic stripe card can be read only by a timing clock and a predetermined number of specific signals, and if the read value information has a number of remaining cards, the use of the device such as a game machine is prohibited. In addition to rewriting the number of games remaining at the end of the game on the magnetic stripe, punch holes are made in a predetermined area of the magnetic card according to the number of games remaining and the number of games used when the card is first inserted into the game machine. Furthermore, when the value information is no longer present, the recorded contents of the magnetic stripes 2 and 3 are erased. Therefore, if it has such a configuration,
All fall within the scope of this embodiment.

Second Embodiment In the second embodiment of the present invention, when writing synchronization information etc., a signal as shown in FIG. 14A outputted from the clock generation circuit 18 in FIG.
The signal is modulated by the signal shown in FIG. 14B outputted from the signal generation circuit 16 to obtain the signal shown in FIG. It is something that

In the second embodiment, when a magnetic card is used, the waveform shaping circuit 7
At step 2, the clock D1 shown in FIG. 15b is separated into the specific signal shown in FIG. 15c, and the signal D2 is obtained from the specific signal. This enabled the use of

In the above embodiment, the amplitude of the specific signal D2 is kept constant and the period is changed, but even if the period of the specific signal is kept constant and the amplitude is changed, the same operation and effect as in the second embodiment can be obtained. is obtained.

Further, although the specific signal is described as a sine wave in the second embodiment, it may be a triangular wave or the like.

〔Effect of the invention〕

As described above, according to the present invention, information can be written and read from other magnetic stripes only when there is timing information and a specific signal written on a specific magnetic stripe, and there is no value information. Since the timing information is erased, it is possible to completely prevent the information on the magnetic card from being illegally tampered with or written, and it is also possible to prevent the information from being used illegally.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a state before writing of a magnetic card used in an embodiment of the present invention, Fig. 2 is a configuration diagram showing an example of the configuration of a synchronous information etc. writing device, and Fig. 3 is a diagram showing a configuration example of a writing device for synchronous information, etc. FIG. 4 is a block diagram showing the signal processing system of FIG. 3, FIG. 5 is a diagram showing the state of the magnetic card after writing, and FIG. 6 is a diagram showing the state of the magnetic card issuing machine according to the present invention. FIG. 7 is a block diagram showing the signal processing system of the game machine, and FIG. 8 is a block diagram showing an example of the configuration of a waveform shaping circuit. , FIG. 9 is an operation waveform diagram of the synchronous information, etc. writing device, FIG. 10 is a flowchart shown to explain the operation of the synchronous information, etc. writing device, and FIG. 11 is a flowchart shown to explain the magnetic card issuing operation. Figure 12 is a flowchart for explaining the operation of using a magnetic card, Figure 13 is a flowchart for explaining the operation of the waveform shaping circuit, and Figure 14 is a flowchart for explaining the synchronization information in the second embodiment. A time chart is shown to explain the operation of the writing device, and FIG. 15 is a time chart shown to explain the operation of the waveform shaping circuit in the second embodiment. 1... Magnetic card, 2, 3... Magnetic stripe, 20... Magnetic card issuing machine, 50... Card type game machine.

Claims (1)

[Claims] 1. When a service, etc. is provided using a magnetic card having a magnetic recording medium on which value information is written, the payment is made, and each time the payment is made, the value information of the magnetic recording medium is reduced, and the value information becomes zero. In a magnetic card usage system that enables the use of magnetic cards until
Value information only when there is at least synchronized information,
A security method for a magnetic card usage system, which is characterized in that it is possible to write other information, and that value information and other information can be read only when synchronization information and a specific signal are present.