JPH0378704B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic card for rewriting data on a magnetic card used in card-type public telephones, etc., and a method for rewriting data on the magnetic card.

[Prior art 1] When a magnetic card (hereinafter abbreviated as a card) used in a card-type public telephone is inserted into the card-type public telephone and a call is started, the card is automatically charged according to the normal power at that time. The remaining balance data that shows the number of calls that can be made is now updated.

FIG. 8 is a plan view showing an example of such a card. The card 1 shown in this figure has a magnetic recording area 3 provided on the surface 2 and a plurality of frequency areas 4-1.
-4-n, and as shown in Figure 9 A to C, the frequency area is scratched (cut or scraped) by the number of calls made, and the residual value is indicated by the number of remaining frequency areas. It now shows the possible degrees (remaining balance data).

[Problem 1 to be solved by the invention] By the way, in such a card 1, the number of unscratched power areas is paired with the number of callable power areas, so the number of callable power areas of card 1 is set as n. In this case, n number of frequency areas were required, and there was a problem in that it was impossible to record balance data larger than the maximum number of divisions L of the magnetic recording area 3 having a predetermined length.

Furthermore, there is a card shown in FIG. 10 that uses a recording format other than this one. The card 5 shown in this figure stores balance data indicative of the number of telephone calls that can be made in a magnetic recording area 6, and the balance data is rewritten according to the number of telephone calls that can be made.

[Problem 2 to be solved by the invention] Therefore, in this card 5, once the format of the balance data in the magnetic recording area 6 is known, this balance data can be easily rewritten, increasing the security against counterfeiting. The problem is that I can't.

[Purpose of the invention]

In view of the above circumstances, the present invention provides a magnetic card and a magnetic card capable of storing balance data larger than the maximum number of divisions of a magnetic recording area formed with a predetermined length, as well as increasing security against counterfeiting. The purpose is to provide a method for rewriting data on magnetic cards.

[Means for solving problems]

In order to achieve the above object, the magnetic card of the present invention has a linear magnetic storage area with a length capable of magnetic storage corresponding to a predetermined power, and a magnetic storage area of a length that can be magnetically stored corresponding to a predetermined power. In a magnetic card in which the length of the magnetic storage area is substantially reduced in accordance with the frequency of use in order to reduce the value: the magnetic storage area is divided into at least two zones, one zone comprising: A first device in which the length of the magnetic storage area is substantially reduced by changing the magnetically memorizable portion to a non-magnetically memorable state in accordance with the frequency of use, and in which residual value data indicating residual value is stored.
The data area 13 is formed corresponding to the length of the magnetic storage area of the portion that does not change, and the length of the other area that can be magnetically stored is constant and changes in accordance with the residual value data. It is characterized in that the second data area 14 stores data that is rewritable.

In addition, in one area of the magnetic card, the magnetic storage area is changed from a magnetic storage area to a non-magnetic storage area according to the number of times the card is used, so that the length of the magnetic storage area is substantially reduced, and the remaining magnetic storage area is changed. The first part stores the quotient data X when dividing the usable frequency (SUM) indicating the residual value by the constant a by area.
In the other area, the length of the magnetically memorable part is constant, and the remainder data Y when dividing the usable number (SUM) by the constant a is rewritably stored. The second data area 14 may be configured such that the second data area 14 is

In addition, as a data rewriting method for the magnetic card, for a magnetic card in which a magnetic storage area of a length that can be magnetically stored corresponding to a predetermined frequency is formed in a linear shape, the usage frequency of the magnetic card is In a data rewriting method for a magnetic card, the length of the magnetic storage area is substantially reduced in accordance with the frequency of use in order to reduce the residual value according to the frequency of use. In one area, the magnetic storage area is changed to a non-magnetic storage area according to the frequency of use, and the length of the magnetic storage area is substantially reduced, and the remaining magnetic storage area is Therefore, the first data area 13 is used to store the quotient data X when the usable frequency (SUM) indicating the residual value is divided by the constant a, and the other area is the area of the part that can be magnetically stored. is constant, and the residual data Y when dividing the usable frequency (SUM) by a constant a is used as the second data area 14 for rewritably storing the residual value data, and the usable frequency is Accordingly, each time the quotient data X decreases by "1", the first data area 13 is mechanically reduced by one data area length, and the second
To provide a data rewriting method for a magnetic card, characterized in that surplus data Y stored in a data area 14 of a magnetic card is updated and stored.

Furthermore, the magnetic storage area is used as a data area 41 in which the length of the magnetic storage area is reduced by changing the magnetic storage area to a non-magnetic storage state in accordance with the frequency of use, and the remaining magnetic storage area is reduced. Quotient data (U-
1) is stored, and each time the quotient data (U-1) decreases by "1" according to the usage frequency, one data area is divided by the usable frequency (SUM) by the constant b. The magnetic card data rewriting method may be such that the remaining data V is rewritten to 0, and the 1 data area portion is mechanically reduced each time the remaining data V becomes "0".

[Effect]

In the magnetic card and the magnetic card rewriting method according to the present invention, the residual value data, for example, the fixed frequency balance data SUM is stored in advance in the first data area 13 part formed by the maximum number of divisions, and the quotient data multiplied by a constant a. It can be memorized with X. 1 every time the quotient data X decreases by 1 due to a change in the frequency of use
Only the data area is mechanically erased, but the remaining data Y is updated and stored in the second data area 14.

In addition, in another method of rewriting a magnetic card, one data area 41 contains quotient data U-
It is also possible to store balance data SUM obtained by multiplying 1 by a constant b. In this case, if there is a change in the frequency of use, the surplus data V will be stored in one data area.
is written, and this one data area portion is mechanically erased every time the surplus data V becomes "0".

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a plan view showing a first example of a card used in the magnetic card data rewriting method according to the present invention. In this figure, 10 is a thin plate-like card made of plastic, paper, etc. On one side 11 of this card 10, a magnetic recording area 12 is arranged in a long straight line in the horizontal direction (left-right direction in the figure). It is formed.

A residual value is stored in the magnetic storage area 12. This residual value is residual value data or usable frequency data (remaining money data) SUM
is stored, and is divided in advance into a first data area 13 and a second data area 14, each having a predetermined length. When the first data area 13 is unused, all "1" data in the data areas 15-1 to 15-n are recorded, and each time the first data area 13 is used, the data areas 15-1 to 15-n are scratched sequentially from the end. It is designed to represent the quotient data X when divided by the number of data areas remaining without being scratched, that is, the constant a of the balance data SUM.

In other words, when you put the card 10 into a public phone and make a call, the first data area 13 is scratched from the end as shown in FIG. Therefore, the quotient data X written here cannot be increased again. Therefore, it is virtually impossible to tamper with data in this first data area 13.

Further, the second data area 14 is a rewritable storage area that stores the remainder (remainder data) Y when the balance data SUM is divided by a constant a and check data CD for checking the value of the balance data SUM. , a predetermined value of "0" or more and "(a-1)" or less is written as surplus data Y in an unused state.

In this way, in this embodiment, the quotient data X when dividing the usable frequency (remaining money data) SUM by the constant a is the first data area 13
, and the surplus data Y is recorded in the second
Since the data is recorded in the data area 14 in a rewritable manner, if the number of data areas that can be formed in the first data area 13 is n, it is possible to store a maximum of "a・n+Y" frequencies.
The recording frequency can be increased, and the same effect as virtually increasing the recording length can be obtained.

Furthermore, in this case, the format of the data recorded in the first data area 13 and the second data area 1
Because the formats of the data recorded in 4 are different from each other and there is no boundary between these data,
It is difficult to decipher the data recorded in the magnetic storage area 12 by simply reading it, thereby increasing the confidentiality of the data.

FIG. 3 is a functional block diagram showing an example of a card rewriting device for rewriting information on the card 10 shown in FIG.

In this figure, 20 is a card that specifies the reading position of data recorded on the card 10.
When a data reading position is designated by the card head position driving means 20, the data reading means 21 moves the reading head to this data reading position and stores the data in the magnetic storage area 12. The data is read out and supplied to the data separation means 22.

The data separating means 22 separates the data DD output by the data reading means 21 into quotient data X, remainder data Y, and check data CD based on the head position data HD output from the card head position driving means 20. , the quotient data X and the remainder data Y obtained here are supplied to the addition means 23, and the remaining data, check data
The CD is supplied to the data match determining means 24.

The addition means 23 multiplies the quotient data X by a and adds it to the remainder data Y, and this addition result (remaining money data) SUM is the data match determination means 2.
4. The data matching determination means 24 determines the remaining balance data based on the check data CD.
This is to determine whether SUM is the correct value.
If the remaining balance data SUM is not a correct value, a card ejecting command SD is output to the card ejecting means 25 to eject the card 10, and the remaining amount data is
If SUM is a correct value, a call permission command SI is output to the call circuit (not shown) and the balance data SUM is supplied to the settlement means 26.

The settlement means 26 is operated by the hook command FS supplied when the telephone receiver is picked up, and each time frequency data SP indicating the number of calls is supplied, "1" is subtracted from the balance data SUM and a new value is calculated. The remaining money data SUM is obtained, and this new remaining money data SUM is divided by a constant a, and each time the value of the quotient data X obtained thereby decreases by "1", the scratch position data ARD is supplied to the erasure positioning means 27. The scratch head or the card 10 is advanced by a necessary step, and a scratch command SS is supplied to the data erasing means 28 to scratch the data area 13 of the card 10.

Next, the hook command FS is canceled,
When the new balance data SUM becomes “0”, this settlement means 26 uses the last obtained balance data SUM.
is supplied to the storage means 29. The storage means 29 stores the balance data SUM, and supplies the stored balance data SUM to the calculation means 30. The calculating means 30 creates check data CD from the balance data SUM, and then calculates the check data CD from the balance data SUM.
SUM is divided by a constant a to obtain remainder data Y. Once this remainder data Y is obtained, a write head control command RS is supplied to the write head means 31 to control the write head to the second data area 14 of the card 10. or move the card 10 to position the second data area 14 of the card 10 at the write head, and write the surplus data Y and check data to the data rewriting means 32.
After supplying a CD to cause the data in the second data area 14 to be rewritten, a card discharge command SD is supplied to the card discharge means 25 to cause the card 10 to be discharged.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

First, when a customer picks up the phone of a card-type public telephone and inserts the card 10 into the card slot, the card head position driving means 20 drives the data reading means 21 to read the first data area 13 of the card 10. The quotient data X, remainder data Y, and check data CD recorded in the second data area 14 are read and supplied to the data separation means 22, where the data is separated (step
SP1, SP2).

Of the separated data, the quotient data X and the surplus data Y are supplied to the adding means 22, where a. This balance data is based on the check data CD.
It is determined whether SUM is the correct value (step
SP4), if this is not correct, the card 10 is ejected and the operation ends; if this is correct, this balance data SUM is supplied to the settlement means 26, and a telephone conversation is possible (step SP5).

Next, when the frequency data SP is supplied in the call state, the settlement means 26 decrements the remaining amount data SUM by the value "1" to obtain new remaining amount data SUM, and also calculates this new remaining amount data SUM by a constant a. When the quotient data X obtained by dividing becomes smaller by "1" (step SP6), the erasing positioning means 27 and the data erasing means 28 are controlled to erase the unscratched part of the first data area 13 into one data area. After scratching the length (step SP7), repeat this action.

Next, the balance data SUM becomes “0”,
When the telephone call ends (step SP8), this balance data SUM is supplied to the storage means 29 to be stored therein, and this balance data SUM is also supplied to the calculation means 30. The calculation means 30 creates check data CD from this balance data SUM, and after calculating the remainder data Y by dividing the balance data SUM by a constant a (step SP9), controls the write head means 31 and the data rewriting means 32. Then, the check data CD and surplus data Y are written in the second data area 14 of the card 10 (step SP10), and then the card 10 is ejected.

Further, in this embodiment, the first data area 1
The timing of scratching 3 and the timing of rewriting data in the second data area 14 are intentionally shifted, but these scratching operations and data The rewriting operations may be executed simultaneously.

Figure 5 shows the second card used in this invention.
FIG. 3 is a plan view showing an example. Card 40 shown in this figure
The difference from that shown in FIG. 1 is that the second data area is not formed in advance with a constant length, but only the first data area 41 is used, and the data area 43- within the first data area 41 is 1 data area length 43-u to be scratched among 1 to 43 to n
The part has the same function as the second data area of the first example,
That is, it has the function of recording surplus data and check data CD.

In other words, the first data area 41 is composed of data areas 43-1 to 43-1 having a predetermined data area length n.
43 to n, the number U of parts that have not been scratched and the surplus data V that has not been used until the constant b to be scratched, the remaining money data SUM=
It is expressed as b・(U-1)+V.

In the first example, when the quotient data X becomes smaller by 1,
The remainder data was recorded in the second data area by scratching, but in the second example, the quotient data U-1 was 1.
Even when it gets smaller, it doesn't scratch and that part becomes the second
It is rewritten and used as a data area.

FIG. 6 is a functional block diagram showing an example of a card rewriting device that realizes such data rewriting. In this figure, the same reference numerals are given to the parts corresponding to those in FIG. 3. In this figure, 50 is for classifying the data DD supplied from the data reading means 21 into the number of unscratched portions, that is, quotient data (U-1), remainder data V, and check data CD. The quotient data (U-1) and the remainder data V obtained in the above are supplied to the addition means 51, and the check data CD is supplied to the data coincidence determination means 24. The addition means 51 calculates SUM=b・(U-1)+
Performs addition operation of V. This balance data SUM is
The data is supplied to the data matching determining means 24.

The data matching determination means 24 checks the check data.
Based on the CD, if the balance data SUM is not a correct value, output a card ejection command SD,
The card 10 is ejected, and if the balance data SUM is a correct value, a call permission command SI is outputted and the balance data SUM is supplied to the settlement means 52.

Each time the frequency data SP is supplied, the settlement means 52 subtracts "1" from the balance data SUM to obtain new balance data SUM, and
This new balance data SUM is divided by the constant b, and each time the remainder data V becomes 0 among the values of the quotient data (U-1) and the remainder data V obtained thereby, the erase positioning means 27 The scratch position data ARD is supplied to position the scratch head at the scratch position, and the scratch command SS is then supplied to the data erasing means 28 to erase the card 40.
1 data area 43-u is scratched.

Next, the hook command FS is canceled,
If the new balance data SUM is “0”, this settlement means 52 uses the last obtained balance data.
SUM is supplied to the storage means 29. Storage means 29
supplies the balance data SUM to the calculation means 53.

After creating the check data CD from the balance data SUM, the calculation means 53 calculates the balance data
SUM is divided by a constant b to obtain quotient data (U-1) and remainder data V, and a write head control command RS is supplied to the write head means 3.
Move the write head or card 40,
1 data area 43-u, and supplies the surplus data V and check data CD to the data rewriting means 32 to rewrite the data in the 1 data area 43-u. Supply the card ejection command SD to eject the card.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

Now, when the customer picks up the receiver and inserts the card 40 into the card slot, the data reading means 21 reads the data recorded on the card 40, and the data separating means 50 extracts the unscratched partial data U. , remainder data V, check data
The signal is separated into CD (SP11), supplied to the adding means 51, and calculated as SUM=b.(U-1)+V (SP12). Next, this balance data SUM is
The data is supplied to the data match determining means 51 and compared with the check data CD, and it is determined whether the SUM is correct (SP13).

If SUM is incorrect, a card ejection command SD is output and the card 40 is ejected, and if correct, a call permission command SI is output and balance data SUM is supplied to the settlement means 52 (SP14). As a result, the settlement means 52 starts the settlement operation, and each time the frequency data SP is supplied,
Subtract "1" from the balance data SUM to obtain new balance data SUM, and divide SUM by the constant b. When the remainder V becomes 0, 43- of the data areas 43-1 to 43-n Scratch u (SP15, SP16).

Then the call ends and the balance data SUM
becomes "0", the settlement means 52 sends the last obtained balance data SUM to the storage means 29, and the stored balance data SUM is supplied to the calculation means 53.

The calculation means 53 creates check data CD based on the balance data SUM, and
Divide the balance data SUM by constant b to obtain quotient data U
-1. After finding the surplus data V (SP18), control the write head means 31 and data rewriting means 32 to write the check data CD and the surplus data V into the data area 43-u of the card 40 (SP10). , the card 40 is ejected.

Thus, in the second implementation example, the card 40
In this case, the second data area is not provided as in the first example, and as a result, the data area 40 can be taken up to the full extent of the card stripe.The amount of data increases, and the area to be scratched is filled with check data CD and surplus data. Since data V is written, security against forgery can be increased, similar to the first example.

In each of the embodiments described above, the first data areas 13 and 41 are scratched to make it impossible to increase the value of the data recorded in this area, but this area may also be punched or embossed to prevent playback. A similar effect can be obtained by erasing it in an impossible way.

〔Effect of the invention〕

As explained above, in the magnetic card and magnetic card data rewriting method according to the present invention, the magnetic storage area of the magnetic card is divided into at least two areas, and residual value data or quotient data is multiplied by a constant. The first part where the balance data is stored
and a second data area that stores data that changes in accordance with the residual value or surplus data of the balance data that changes with use in an updatable manner, and the quotient data changes according to the frequency of use. Since the first data area is erased each time the first data area decreases by "1" and the remaining data is updated and stored, the magnetic recording area of a predetermined length can be increased and used. Since it is possible to store large frequency data that is a constant multiple of the number of divisions, and the magnetic storage area is provided with two data areas of different formats, it is possible to improve safety against forgery.

In another magnetic card data rewriting method, the balance data obtained by multiplying the quotient data by a constant is stored in one data area, and if the usage frequency changes, one data area part of this data area is transferred to the surplus data area. The structure is such that this one data area is mechanically erased each time the surplus data reaches "0", allowing more balance data to be stored and providing additional security against forgery. can be increased.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of a magnetic card used in the method for rewriting data on a magnetic card according to the present invention, and FIGS. 2A to 2C are plan views for explaining the method for rewriting data on a magnetic card, respectively. , FIG. 3 is a functional block diagram showing an example of a card rewriting device for rewriting information on a magnetic card, FIG. 4 is a flowchart for explaining the operation of this card rewriting device, and FIG. 5 is a magnetic card according to the present invention. FIG. 6 is a functional block diagram showing an example of a card rewriting device for rewriting information on this magnetic card, and FIG. 7 is a plan view showing a second embodiment of a magnetic card used in the data rewriting method. Flowchart to explain the operation,
FIG. 8 is a plan view showing an example of a conventional magnetic card;
9A to 9C are plan views for explaining the data rewriting method of this magnetic card, and FIG. 10 is a plan view showing another example of the conventional magnetic card. 10, 40... Card, 12... Magnetic storage area, 13, 41... First data area, 14...
Second data area.

Claims (1)

[Claims] 1. A magnetic storage area of a length that can be magnetically stored corresponding to a predetermined number of degrees is formed in a linear shape, and in order to reduce the residual value according to the number of times of use of the magnetic card, the magnetic storage area is In a magnetic card in which the length of the magnetic storage area is substantially reduced in accordance with the frequency of use: the magnetic storage area is divided into at least two areas, one of which has a length corresponding to the frequency of use; A first part in which the length of the magnetic storage area is substantially reduced by changing the magnetically memorable portion to a non-magnetically memorable state, and in which residual value data indicating a residual value is stored.
A data area 13 is formed, and the other area is a second data area in which the length of the magnetically storable portion is constant and data that changes in accordance with the residual value data is stored in a rewritable manner. A magnetic card characterized by the number 14. 2. A magnetic storage area with a length that can be magnetically stored in accordance with a predetermined number of uses is formed in a linear shape, and the residual value is reduced according to the number of uses of the magnetic card, so that the length of the magnetic storage area is In a magnetic card that is substantially reduced in accordance with the number of uses: the magnetic storage area is divided into at least two areas, one of which has a magnetic storage area corresponding to the number of uses; When the magnetic storage area is changed to a non-memory state and the length of the magnetic storage area is substantially reduced, the remaining magnetic storage area is the quotient when the usable number (SUM), which indicates the residual value, is divided by a constant a. The first data area 13 is where data A magnetic card having a second data area 14 in which surplus data Y is rewritably stored. 3. For a magnetic card in which a magnetic storage area of a length capable of magnetic storage corresponding to a predetermined frequency is formed in a linear shape, the residual value is reduced according to the frequency of use of the magnetic card. In a method for rewriting data on a magnetic card, which substantially reduces the length of the magnetic storage area in accordance with the frequency of use, the magnetic storage area is divided into at least two areas, one of which has the following steps: The length of the magnetic storage area is substantially reduced by changing the magnetically memorable portion to a non-magnetically memorable state in accordance with the usage frequency, and the remaining magnetic storage area represents the usable frequency. The first data area 13 is used to store the quotient data X when (SUM) is divided by the constant a, and the other area has a constant area of the magnetically memorizable portion and the usable frequency. The remainder data Y when (SUM) is divided by the constant a is used as the second data area 14 for rewritably storing the residual value data, and the quotient data X becomes smaller by "1" depending on the frequency of use. mechanically decreases the first data area 13 by one data area length each time, and
A data rewriting method for a magnetic card, characterized in that surplus data Y stored in a data area 14 of the magnetic card is updated and stored. 4. For a magnetic card in which a magnetic storage area of a length that can be magnetically stored corresponding to a predetermined frequency is formed in a linear shape, the residual value is reduced according to the frequency of use of the magnetic card. In a data rewriting method for a magnetic card, which substantially reduces the area of the magnetic storage area in accordance with the frequency of use: The remaining magnetic storage area is used as a data area 41 where the length of the magnetic storage area is reduced by changing the state, and the usable count (SUM) indicates the residual value.
The quotient data (U-1) when dividing by the constant b is stored, and one data area portion can be used each time the quotient data (U-1) decreases by "1" according to the frequency of use. The magnetic card is characterized in that it rewrites residual data V when a frequency (SUM) is divided by the constant b, and mechanically reduces the one data area portion each time the residual data V becomes "0". How to rewrite data.