JP6956657B2 - Magnetic card device - Google Patents

Description

The present invention relates to a magnetic card device that reads and writes information to a magnetic card.

With magnetic cards and passbooks on the market, the magnetism of the magnetic stripe is attenuated by approaching / contacting an external magnet, and reading with a magnetic card device may result in an error. In particular, recently, many electronic devices such as smartphones / tablets around us and products with magnets built into their cases have been distributed, and the risk of magnetic attenuation (destruction) is increasing. As a specific example, there are some cases where a card magnetically attenuated by an automated teller machine (ATM) or the like becomes untransactionable and develops into a complaint at a branch office of a financial institution or the like.

As one of the countermeasures, a technique has been proposed in which the data read from the magnetic stripe is rewritten on the magnetic stripe whose output is attenuated to restore the magnetic output (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-318414

Cards with attenuated magnetism are often unstable in reading, so there is a risk of misreading the data. At the time of rewriting, the data based on the read data is recorded on the magnetic stripe, so if the read data is incorrect, the incorrect data will be recorded. If you use this card, an error will be judged. In addition, if the output is attenuated due to poor physical condition of the card itself such as deformation, scratches, or sticking a sticker, there is a high possibility that normal recording will not be possible even if the card is rewritten.

As described above, when the magnetic output is greatly attenuated, even if the card is uniformly rewritten, the magnetic output cannot always be restored to a normal level. On the contrary, it may worsen.

In view of the above problems, an object of the present invention is to provide a magnetic card device capable of effectively rewriting a magnetic stripe whose magnetic output is attenuated.

In order to achieve the above object, the magnetic card device that reads and writes the information of the magnetic stripe of the card by the magnetic head includes a jitter evaluation unit that evaluates the jitter indicating the time variation of the magnetic output read by the magnetic head. a magnetic output evaluation unit for evaluating the level of the magnetic output that is the reading, comprising a preventive rewrite determining unit that judgment whether to preventing rewriting to rewrite information in the magnetic stripe on the magnetic stripe read, The preventive rewriting determination unit is based on the evaluation of the jitter by the jitter evaluation unit and the evaluation of the level of the magnetic output by the magnetic output evaluation unit, and the preventive rewriting is performed when the recovery of the magnetic output can be expected. It is determined that the rewriting is performed, and on the other hand, if the recovery of the magnetic output cannot be expected even if the preventive rewriting is performed, it is determined that the preventive rewriting is not performed.

According to the present invention, it is possible to provide a magnetic card device capable of effectively rewriting a magnetic stripe whose magnetic output is attenuated.

It is a block diagram which shows the configuration example of the automatic teller machine equipped with the magnetic card device. It is a block diagram which shows the structural example of a card receipt unit. It is a block diagram concerning a reading function and a writing function of MS. It is a block diagram which shows the hardware composition of the unit management part and each control part of a card receipt unit. It is a flowchart explaining the procedure of the preventive rewrite processing. This is an example of a magnetic output waveform. This is an example of a preventive rewriting necessity judgment table. It is a figure which shows the attenuation example of the magnetic output of the card which damaged MS. It is a figure which shows the relationship between the attenuation of the magnetic output of a card which damaged MS and jitter. It is a figure which shows the relationship between the magnetic output of a card with a tape attached to MS, and jitter.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, an example in which the magnetic card device of the present embodiment is mounted on an automated teller machine installed in a financial institution will be described.

FIG. 1 is a block diagram showing a configuration example of an automated teller machine 1 equipped with the magnetic card device of the present embodiment. The automatic teller machine 1 receives a card on which predetermined data is recorded and performs a transaction process. The automated teller machine 1 is installed in stores such as banks and other financial institutions, and conducts transactions such as deposits and withdrawals based on customer operations.

In the automatic teller machine 1, the operator inserts the card into the insertion slot according to the operation guidance display, inputs the password with the keyboard or touch panel, communicates with the host computer, confirms the identity of the person, and then deposits cash. , Withdrawal, transfer, etc. note that. Hereinafter, the magnetic card and the magnetic card with an IC chip are collectively referred to as a card.

The automated teller machine 1 includes a main control unit 10, a card receipt unit 20, a passbook unit 30, a banknote unit 40, a coin unit 50, and a display unit 60. The main control unit 10 is a control unit that comprehensively controls the entire automated teller machine 1. The card receipt unit 20 includes a card processing device that reads information (magnetic stripe or IC memory) recorded on the card, and a receipt printing device that prints and issues receipts.

The passbook unit 30 includes a reading device (not shown) that reads data from the MS (Magnetic Stripe) of the inserted passbook, and a printer device (not shown) that prints transaction details on the passbook. The banknote unit 40 conveys the deposited banknotes and stores them in the banknote cassette, and then conveys the banknotes from the banknote cassette and withdraws them. The coin unit 50 stores the deposited coins in the coin cassette and withdraws the coins from the coin cassette. The display unit 60 has a display unit and a touch panel, displays an operation guide and transaction details to the customer, and receives an operation input from the customer on the touch panel.

FIG. 2 is a block diagram showing a configuration example of the card receipt unit 20. The card receipt unit 20 includes a unit management unit 100, a communication unit 110, a storage unit 120, a card R / W mechanical control unit 130, a card R / W mechanism 140, a magnetic head control unit 150, a magnetic head circuit unit 180, and an IC card R. It has a / W control unit 200, a contact unit 210, a receipt printer control unit 220, and a receipt printer mechanism 230. The magnetic card device is composed of a unit management unit 100, a communication unit 110, a storage unit 120, a card R / W mechanical control unit 130, a card R / W mechanism 140, a magnetic head control unit 150, and a magnetic head circuit unit 180.

The unit management unit 100 controls the entire card receipt unit 20. The communication unit 110 controls the exchange of data between the main control unit 10 and the unit management unit 100. The storage unit 120 stores a control program, various data, and a table.

The card R / W mechanical control unit 130 controls the card R / W mechanical 140 to control the transfer of cards. The card R / W mechanism 140 includes a motor for transporting the card, a magnet for switching the transport roller, a sensor for detecting the card transport position and speed, and the like.

The magnetic head control unit 150 controls the magnetic head circuit unit 180 to read data from the MS of the card and write data to the MS. Further, the magnetic head control unit 150 decodes the read magnetic output to generate read data. Further, the magnetic head control unit 150 performs a rewriting process (also referred to as preventive rewriting) to the MS.

The magnetic head circuit unit 180 includes a magnetic head, a peak detection circuit, a magnetic output detection circuit, a timer circuit, and a light data output circuit. The magnetic head control unit 150 and the magnetic head circuit unit 180 will be described in detail with reference to FIG.

When the card used is a card with an IC chip, the IC card R / W control unit 200 reads the IC data built in the card by the contact unit 210. As the contact portion 210, an IC contact portion and a SAM (Secure Application Module) contact portion are provided.

The receipt printer control unit 220 controls the motor and printer (ink ribbon and thermal printer) of the receipt printer mechanism 230 to convey and print paper.

FIG. 3 is a block diagram relating to the reading function and the writing function of the MS. As described above, the magnetic head circuit unit 180 includes a magnetic head 181, a peak detection circuit 182, a magnetic output detection circuit 183, a timer circuit 184, and a light data output circuit 185.

The magnetic head 181 reads and writes to the MS, and is, for example, a ring head. The peak detection circuit 182 is a circuit that detects the peak of the magnetic output waveform output from the magnetic head 181 and amplified. The peak detection circuit 182 notifies the MS read interrupt processing unit 151, which will be described later, of peak detection.

The magnetic output detection circuit 183 is a circuit that detects the peak level of the magnetic output waveform. The magnetic output detection circuit 183 notifies the MS read interrupt processing unit 151, which will be described later, of the peak level of the magnetic output waveform. In the following, the peak level of the magnetic output waveform is also referred to as the magnetic output level.

When the peak detection interrupt occurs in the MS read interrupt processing unit 151, the timer circuit 184 reads the counter value and notifies the MS read interrupt processing unit 151 of the counter value. The write data output circuit 185 outputs a write signal to the magnetic head 181 when writing data to the MS.

The magnetic head control unit 150 includes an MS read interrupt processing unit 151, an MS read processing unit 160, an MS write processing unit 170, and an MS write interrupt processing unit 172. The MS read interrupt processing unit 151 receives the peak detection notification from the peak detection circuit 182 and performs interrupt processing.

The MS read interrupt processing unit 151 includes a peak interval calculation unit 152 and a magnetic output reading unit 153. The peak interval calculation unit 152 calculates the time between peaks of the magnetic output. The peak interval calculation unit 152 stores the calculated peak interval in the peak interval buffer 121 of the storage unit 120. For example, 1536 peak interval buffers 121 are set.

The magnetic output reading unit 153 reads the level of the magnetic output. The magnetic output reading unit 153 stores the read magnetic output level in the magnetic output level buffer 122 of the storage unit 120. For example, 1536 magnetic output level buffers 122 are set. FIG. 6 is an example of a magnetic output waveform. FIG. 6 shows the peak interval and the position of the magnetic output level in the magnetic output B1 which is an enlarged view of the normal waveform.

The MS read processing unit 160 processes data read from the MS stored in the peak interval buffer 121 and the magnetic output level buffer 122 to generate read data. Further, the MS read processing unit 160 determines whether or not preventive writing is necessary.

The MS read processing unit 160 includes a jitter evaluation unit 161, a magnetic output evaluation unit 162, a 0/1 conversion unit 163, a read data editing unit 164, a read data result determination unit 165, and a preventive rewriting necessity determination unit 166.

The jitter evaluation unit 161 reads the peak interval from the peak interval buffer 121, calculates the jitter which is the time variation of the magnetic output peak, and evaluates it. The magnetic output evaluation unit 162 reads the magnetic output level from the magnetic output level buffer 122 and evaluates it.

The 0/1 conversion unit 163 reads the stored value of the peak interval buffer 121 and the stored value of the magnetic output level buffer 122, and converts the value to the logical value 0/1. The read data editing unit 164 stores the logical value 0/1 converted by the 0/1 conversion unit 163 in the storage unit 120 as read data 123. The read data result determination unit 165 reads the read data 123, checks the vertical parity and the horizontal parity, determines whether or not the read has been performed normally, and stores the read result 124 in the storage unit 120.

The preventive rewriting necessity determination unit 166 determines the necessity of preventive rewriting. The preventive rewriting is a process of writing information again to the MS whose magnetic output is attenuated and recovering the magnetic output. The preventive rewrite necessity determination unit 166 determines the necessity of preventive rewrite according to the magnetic output level and the jitter with reference to the necessity determination table 125 of the memory 120. The preventive rewriting necessity determination unit 166 stores the determined preventive rewrite necessity 126 in the storage unit 120. Details will be described later in FIGS. 5 and later.

When the preventive rewrite necessity determination unit 166 determines that the preventive rewrite is necessary, the MS write processing unit 170 creates write data 127 for writing to the MS from the read data 123 of the storage unit 120 and stores it. It is stored in the unit 120.

The MS write interrupt processing unit 172 reads the write data 127, performs predetermined conversion (for example, frequency modulation), and outputs the write data 127 to the light data output circuit 185. The write data output circuit 185 outputs a write signal to the magnetic head 181. The magnetic head 181 is moved at a predetermined speed by the card R / W mechanical control unit 130, and data is rewritten to the MS of the card.

FIG. 4 shows the hardware of the unit management unit 100 of the card receipt unit 20 and each control unit (card R / W mechanical control unit 130, magnetic head control unit 150, IC card R / W control unit 200, receipt printer control unit 220). It is a block diagram which shows the wear configuration.

The card receipt unit 20 is provided with a CPU (Central Processing Unit) 300, a RAM (Random Access Memory) 302, a ROM (Read Only memory) 304, a bus 306, a communication unit 110, and a storage unit 120.

The CPU 300 reads a control program from the ROM 304 and executes various control processes according to the read control program. The RAM 302 is a work area for temporarily storing a control program and various data. The RAM 302 is, for example, a DRAM (Dynamic Random Access Memory). The ROM 304 is a non-volatile storage unit that stores a control program, various data, and the like. ROM 304 is, for example, firmware. The CPU 300 is connected to the RAM 302, the ROM 304, etc. by the bus 306. The communication unit 110 and the storage unit 120 are as described above. The storage unit 120 is, for example, a flash memory.

That is, the unit management unit 100 and each control unit (card R / W mechanical control unit 130, magnetic head control unit 150, IC card R / W control unit 200, receipt printer control unit 220) are realized by software processing by the CPU 300 or the like. Will be done.

Next, the preventive rewriting process for the MS of the card will be specifically described. FIG. 5 is a flowchart illustrating the procedure of the preventive rewriting process. The preventive rewriting process is mainly executed by the unit management unit 100, the card R / W mechanical control unit 130, and the magnetic head control unit 150.

The unit management unit 100 detects the card insertion from the customer by a card sensor (not shown), and when the card insertion is detected, the unit pulls the card into the automatic teller machine 1 (step S10). The magnetic head control unit 150 reads the MS of the card (step S12).

The peak interval is detected by the peak detection circuit 182, and the peak interval calculation unit 152 stores the peak interval (timer value) in the peak interval buffer 121. The magnetic output level is detected by the magnetic output detection circuit 183, and the magnetic output reading unit 153 stores the detected magnetic output in the magnetic output level buffer 122. The read data editing unit 164 stores the data converted to the logical value 0/1 by the 0/1 conversion unit 163 as the read data 123.

The read data result determination unit 165 determines whether or not the read has been performed normally by performing a parity check or the like on the read data 123 (step S14). In addition, in the determination of whether or not the read is normal, the reading may be executed a plurality of times (retry operation) to determine. When the read data result determination unit 165 determines that the read has not been performed normally (No in step S14), the magnetic head control unit 150 returns the card to the customer (step S22).

An example of the waveform of the magnetic output will be described with reference to FIG. The magnetic output A is an example of the magnetic output of a normal card. The magnetic output B is an example of the magnetic output of a partially attenuated card. In each case, the vertical axis is voltage and the horizontal axis is time. Below the magnetic output B, an enlarged view of a part of the magnetic output B is shown.

The magnetic output B1 is an enlarged view of a normal portion of the magnetic output B. The peak interval calculated by the peak interval calculation unit 152 and the magnetic output level read by the magnetic output reading unit 153 are shown in the magnetic output B1, respectively. The bit is determined from the peak of the magnetic output waveform.

The magnetic output B2 is an enlarged view of the attenuated portion of the magnetic output B. The attenuation of the magnetic output is, for example, the effect of scratches on the card or an external magnetic field. When the magnetic output level falls below a predetermined level, as shown in the figure, the peak of the magnetic output waveform cannot be found, and bit omission occurs. For example, when the magnetic output is 3% or less of the normal value, normal reading becomes difficult.

Return to FIG. When the magnetic head control unit 150 determines that the read data result determination unit 165 has performed the read normally (Yes in step S14), the preventive rewrite necessity determination unit 166 refers to the preventive rewrite necessity determination table 125. , Determine the necessity of preventive rewriting (step S16).

FIG. 7 is an example of the preventive rewriting necessity determination table 125. As described above, the preventive rewrite necessity determination unit 166 determines the preventive rewrite necessity for the card determined to have been read normally according to the magnetic output level and jitter of the read MS. In this example, the preventive rewriting necessity determination unit 166 requires preventive rewriting based on a total of four conditions of "magnetic output level", "number of continuous magnetic output reductions", "jitter", and "additional condition (# 1)". An example of determining whether or not to use will be described.

The magnetic output evaluation unit 162 evaluates the "magnetic output level" and the "number of continuous output reductions". The jitter evaluation unit 161 evaluates the "jitter" of the magnetic output. Then, the preventive rewriting necessity determination unit 166 evaluates the "additional condition (# 1)".

The necessity determination table 125 is composed of items No. 1 to No. 6. The description will be given in order from No1.

No1: When the magnetic output level is ± 70% or more, the preventive rewriting necessity determination unit 166 determines that rewriting is unnecessary regardless of other conditions. This is because the card is assumed to be a normal card and there is no need to rewrite it.

No2: The preventive rewriting necessity determination unit 166 determines that rewriting is unnecessary even when the magnetic output level is less than ± 5% in one or more places. ± 5% is an example of a read limit value. This is because when the magnetic output level is equal to or less than the read limit, there is a possibility of erroneous reading even if the read data result determination unit 165 determines that the read is normal. Also, it may not be caught by the parity check. That is, if the data is rewritten based on the result of misreading, the data will be overwritten with the erroneous data, so that the rewriting is not performed.

No3: The preventive rewriting necessity determination unit 166 determines that rewriting is unnecessary when the magnetic output level is ± 5% to 70% at one place or more and the number of continuous magnetic output reductions is less than 25 times. The number of consecutive magnetic output reductions is the number of consecutive waveforms with a magnetic output level of ± 5% to 70%. Details will be described with reference to FIG. This card is. It is assumed that the card has scratches on the MS. Since the recovery of the magnetic output cannot be expected at the scratched part even if it is rewritten, the preventive rewriting necessity determination unit 166 determines that the rewriting is unnecessary.

The number of continuous magnetic output reductions may be the continuous magnetic output reduction time. The continuous time for decreasing the magnetic output is, for example, 16 msec. That is, if the period during which the magnetic output level is continuously below the predetermined time is the predetermined time or less, the preventive rewriting determination unit 166 presumes that the MS is damaged and must perform the preventive rewriting. to decide.

FIG. 8 is a diagram showing an example of attenuation of the magnetic output of the card C in which the MS is scratched. As shown in the figure, it is assumed that the MS of the card C has three scratches. K1 is a thin scratch, K2 is a thick scratch, and K3 is an intermediate scratch. The magnetic output C is a magnetic output curve of the card C. The horizontal axis is the coordinates of the MS in the X direction. In the magnetic output C, the magnetic output is greatly attenuated at the positions corresponding to the scratches (K1 to K3). The magnetic output C1 is an enlarged view of the attenuation portion in the central portion of the magnetic output C, and is a diagram for explaining the number of continuous reductions in the magnetic output. Vertical arrows indicate points where the magnetic output is reduced (± 5% to 70%). In the magnetic output C, the number of consecutive magnetic output reductions (± 5% to 70%) is 18 times.

FIG. 9 is a diagram showing the relationship between the attenuation of the magnetic output of the card D in which the MS is scratched and the jitter. It is assumed that the MS of the card D has the same scratches as the card C of FIG. The magnetic output D is a magnetic output curve of the card D. As for the magnetic output D, the magnetic output is attenuated at three positions corresponding to the scratches. The jitter D is the jitter curve of the card D. Jitter D shows a large variation at the positions of the central scratch and the right scratch.

No4: When the preventive rewriting necessity determination unit 166 has one or more places where the magnetic output level is ± 5% to 70%, the number of continuous output reductions is 25 times or more, and the jitter is ± 150% or more. It is judged that rewriting is not necessary. This is because if the jitter is ± 150% or more, it may have been misread. In the case of No4, there is a possibility of misreading as in the case of No2, so the rewriting is not performed.

No5: The preventive rewriting necessity determination unit 166 has one or more places where the magnetic output level is ± 5% to 70%, the number of continuous output reductions is 25 times or more, the jitter is less than ± 150%, and If the additional conditions are satisfied, it is judged that rewriting is unnecessary. The additional condition is a case where the jitter is ± 120% or more at a place where the fluctuation of the magnetic output level is large (the difference from the immediately preceding magnetic output level is a predetermined value or more (for example, a decrease of 40% or more)).

This is because it is assumed that the tape is attached to the MS of this card. This is because there is a possibility that normal recording cannot be performed on the MS even if the tape is rewritten at the place where the tape is attached. This is because the presence of the tape causes a gap between the MS and the magnetic head and causes a large amount of jitter. Also, writing may destroy the current readable state.

FIG. 10 is a diagram showing the relationship between the magnetic output (magnetic output E) and the jitter (jitter E) of the card E to which the tape is attached to a part of the MS. Further, the region of the broken line N of the magnetic output E is the “location where the fluctuation of the magnetic output level is large (the difference from the immediately preceding magnetic output level is equal to or more than a predetermined value (for example, reduced by 40% or more))” explained in the additional condition. show. J1 and J2 are the corresponding jitters. That is, when J1 and J2 are ± 120% or more, the additional condition is satisfied.

In the range where the tape is attached, a gap is formed between the MS and the magnetic head 181, so that the magnetic output is greatly attenuated. Also, the jitter increases at the positions of both ends of the tape. This is because the speed of the card passing through the magnetic head changes greatly at both ends of the tape.

No6: The preventive rewriting necessity judgment unit 166 has one or more places where the magnetic output level is ± 5% to 70%, the number of continuous output reductions is 25 times or more, the jitter is less than ± 150%, and the addition is performed. If the conditions are not satisfied, it is judged that rewriting is necessary. This is because the magnetic attenuation of this card is not caused by scratches or tape, but by an external magnetic field. That is, the recovery of magnetic attenuation can be expected by rewriting.

Return to FIG. The magnetic head control unit 150 determines whether or not rewriting is necessary based on the necessity determination by the preventive rewriting necessity determination unit 166 (step S18).

When the magnetic head control unit 150 determines that rewriting is not necessary (No in step S18), the card R / W mechanical control unit 130 returns the card to the customer after the predetermined transaction processing is completed (step S22). ..

When the magnetic head control unit 150 determines that rewriting is necessary (Yes in step S18), the MS write processing unit 170 generates write data 127 based on the read data 123. The MS write interrupt processing unit 172 performs a predetermined conversion on the light data 127 and outputs the light data 127 to the light data output circuit 185 in synchronization with the timing of the magnetic head 181 transfer by the card R / W mechanical control unit 130. The write data output circuit 185 outputs a write signal to the magnetic head 181 to rewrite the MS (step S20). Then, the card R / W mechanical control unit 130 returns the rewritten card to the customer after the completion of the predetermined transaction processing (step S22).

The conditions for permitting rewriting by the preventive rewriting necessity determination unit 166 are not limited to the condition of No. 6. The preventive rewriting necessity determination unit 166 may allow rewriting only by the magnetic output level (± 5% to 70%) and the jitter (less than ± 150%). Further, only either the number of continuous output reductions or the additional condition may be added to this. Further, the preventive rewriting necessity determination unit 166 may not specify the magnetic output level in a predetermined range such as ± 5% to 70%, but may simply specify only the upper limit such as ± 70% or less. ..

It should be noted that each value of the condition of the necessity determination table 125 described with reference to FIG. 6 is an example and is not limited.

Further, the automatic teller machine 1 may transmit the read data to the host computer to determine whether the read in step S14 has been performed normally, and the host computer may make the determination. This is because it is certain if the host computer determines whether the read data is normal based on the registered customer data. According to this, since the risk of misreading explained in Nos. 2 and 4 of the necessity determination table 125 can be eliminated, rewriting may be performed even in the case of Nos. 2 and 4.

Further, the magnetic card device of the present embodiment is not limited to the automatic teller machine, but can also be used as a credit card or point card processing device or a security device.

<Modification example>
-In the above description, an example in which the card receipt unit 20 determines the necessity of preventive rewriting has been described. However, the card receipt unit 20 may cooperate with the upper side (host computer / application software / middleware) to determine the necessity of preventive rewriting.
-In addition, after the firmware of the card receipt unit 20 detects magnetic attenuation, a mechanism for notifying the upper host may be provided, and preventive rewriting may be performed by receiving write permission from the upper host.
Further, although it has been explained that the unit management unit 100 and the magnetic head control unit 150 are realized by software processing by the CPU 300 or the like, the present invention is not limited to this. For example, a part or all of them may be configured by hardware such as a gate array.

<Effect>
The effects of this embodiment are listed below.
-According to the magnetic card device of the present embodiment, since it is determined whether the preventive writing is effective, it is possible to prevent the currently readable card from becoming a defective card by rewriting. Then, by performing appropriate preventive writing, it is possible to reduce costs such as card reissue and transaction loss.
-Specifically, since the jitter information is used to set a certain limit on the preventive writing function, the risk (card error) at the time of rewriting can be eliminated. That is, when the jitter is large, it is assumed that the condition of the card is bad (deformation / scratch / foreign matter adhesion, etc.), and there is a risk that the card that can be read at the last minute will be a defective card instead of being rewritten. Is.

The present invention is not limited to the above-described embodiment as it is, and the components can be modified and embodied within a range that does not deviate from the gist at the implementation stage. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, all the components shown in the embodiments may be combined as appropriate. In addition, components across different embodiments may be combined as appropriate. It goes without saying that various modifications and applications can be made without departing from the spirit of the invention.

1 Automatic trading device 10 Main control unit 20 Card receipt unit 30 Bankbook unit 40 Bill unit 50 Coin unit 60 Display unit 100 Unit management unit 110 Communication unit 120 Storage unit 121 Peak interval buffer 122 Magnetic output level buffer 123 Read data 124 Read result 125 Necessity judgment table 126 Preventive rewriting Necessity 127 Write data 130 Card R / W mechanical control unit 140 Card R / W mechanical 150 Magnetic head control unit 151 MS read interrupt processing unit 152 Peak interval calculation unit 153 Magnetic output reading unit 160 MS read Processing unit 161 Jitter evaluation unit 162 Magnetic output evaluation unit 163 0/1 Conversion unit 164 Read data editing unit 165 Read data result judgment unit 166 Preventive rewriting necessity judgment unit 170 MS write processing unit 172 MS write interrupt processing unit 180 Magnetic head circuit Unit 181 Magnetic head 182 Peak detection circuit 183 Magnetic output detection circuit 184 Timer circuit 185 Light data output circuit 200 IC card R / W control unit 210 Contact unit 220 Receipt printer control unit 230 Receipt printer mechanism

Claims (10)

In a magnetic card device in which a magnetic head reads and writes information on the magnetic stripe of a card.
A jitter evaluation unit that evaluates jitter indicating time variation of the magnetic output read by the magnetic head, and a jitter evaluation unit.
A magnetic output evaluation unit that evaluates the level of the read magnetic output,
Includes preventive rewrite determining unit that judged whether the information of the magnetic stripe for preventive rewriting rewriting the magnetic stripe read,
The preventive rewriting determination unit performs the preventive rewriting when recovery of the magnetic output can be expected by performing the preventive rewriting based on the evaluation of the jitter by the jitter evaluation unit and the evaluation of the level of the magnetic output by the magnetic output evaluation unit. A magnetic card device characterized in that it is determined that rewriting is to be performed, and on the other hand, it is determined that the preventive rewriting is not performed when recovery of magnetic output cannot be expected even if the preventive rewriting is performed. The prevention rewriting determining unit, in that the magnetic output of the level is below a predetermined as a first condition, in that the jitter is below a predetermined as a second condition, wherein at least the first condition the second condition is satisfied and, a magnetic card device according to the case where recovery of the magnetic output can be expected, in claim 1, characterized in that you judged when performing the preventive rewriting by performing the preventive rewriting. Furthermore, the prevention rewrite determining unit that peak value of the level of the magnetic output is equal to or greater than a predetermined number is continuously number of pulses becomes equal to or less than a predetermined level as the third condition, the second condition and the first condition the third condition is satisfied with the preventive rewriting when recovering magnetic output can be expected by performing the magnetic card according to claim 2, characterized in that it judged when performing the preventive rewriting .. The prevention rewriting determining unit is configured at a position change of the level is equal to or higher than a predetermined magnetic output, said jitter is below a predetermined and fourth condition, the third condition and the second condition and the first condition in addition, further the fourth condition is satisfied, when the preventive rewriting can be expected to recover the magnetic output by performing, magnetic card according to claim 3, characterized in that determines to perform the preventive rewriting Device. The prevention rewriting determining unit is configured at a position change of the level is equal to or higher than a predetermined magnetic output, said jitter is below a predetermined and fourth condition, the fourth condition with the first condition and the second condition is The magnetic card device according to claim 2 , wherein it is determined that the preventive rewrite is performed when the magnetic output is expected to be recovered by the preventive rewrite. In a magnetic card device in which a magnetic head reads and writes information on the magnetic stripe of a card.
A magnetic output evaluation unit that evaluates the level of the magnetic output read by the magnetic head,
Includes preventive rewrite determining unit that judged whether the information of the magnetic stripe for preventive rewriting rewriting the magnetic stripe read,
The preventive rewrite determination unit determines that the preventive rewrite is not performed when the level of the magnetic output by the magnetic output evaluation unit is equal to or lower than a predetermined value and recovery of the magnetic output cannot be expected even after the preventive rewrite is performed. A magnetic card device characterized by that. In a magnetic card device in which a magnetic head reads and writes information on the magnetic stripe of a card.
A magnetic output evaluation unit that evaluates the level of the magnetic output read by the magnetic head,
Includes preventive rewrite determining unit that judged whether the information of the magnetic stripe for preventive rewriting rewriting the magnetic stripe read,
The prevention rewriting determining unit, by the magnetic output evaluation unit, the number of times reaches a predetermined level below the peak level of the magnetic output of the waveform is continuous Ri der than a predetermined number of times, the magnetic output even if the preventive rewriting A magnetic card device characterized in that it is determined not to perform the preventive rewriting when recovery cannot be expected. In a magnetic card device in which a magnetic head reads and writes information on the magnetic stripe of a card.
A magnetic output evaluation unit that evaluates the level of the magnetic output read by the magnetic head,
Includes preventive rewrite determining unit that judged whether the information of the magnetic stripe for preventive rewriting rewriting the magnetic stripe read,
The prevention rewriting determining unit, by the magnetic output evaluation unit, period reaches a predetermined level below the level of the magnetic output is continuously Ri der less than or equal to a predetermined time, even if the preventive rewriting recovery of the magnetic output expectations A magnetic card device characterized in that if it is not possible, it is determined that the preventive rewriting is not performed. In the preventive rewriting method of a magnetic card device in which information on the magnetic stripe of a card is read and written by a magnetic head.
To evaluate the jitter indicating the time variation of the magnetic output read by the magnetic head, and
To evaluate the level of the read magnetic output and
Based on the evaluation of the jitter and the evaluation of the level of the magnetic output, it is determined whether or not to perform a preventive rewriting to rewrite the read magnetic stripe information to the magnetic stripe of the card.
Including
Determining whether or not to perform the preventive rewriting is based on the evaluation of the jitter and the evaluation of the level of the magnetic output, and when the recovery of the magnetic output can be expected by performing the preventive rewrite, the preventive rewrite is performed. A preventive rewriting method for a magnetic card device , which comprises determining that the preventive rewriting is performed, and on the other hand, when the recovery of the magnetic output cannot be expected even if the preventive rewriting is performed, it is determined that the preventive rewriting is not performed. In a program that causes a computer of a magnetic card device that reads and writes information on the magnetic stripe of a card by a magnetic head to perform preventive rewriting processing.
The preventive rewriting process
To evaluate the jitter indicating the time variation of the magnetic output read by the magnetic head, and
To evaluate the level of the read magnetic output and
Based on the evaluation of the jitter and the evaluation of the level of the magnetic output, it is determined whether or not to perform a preventive rewriting to rewrite the read magnetic stripe information to the magnetic stripe of the card.
Including
Determining whether or not to perform the preventive rewriting is based on the evaluation of the jitter and the evaluation of the level of the magnetic output, and when the recovery of the magnetic output can be expected by performing the preventive rewrite, the preventive rewrite is performed. A program characterized in that it is determined that the preventive rewriting is performed, and on the other hand, it is determined that the preventive rewriting is not performed when the recovery of the magnetic output cannot be expected even if the preventive rewriting is performed.

Images