JP2002042048A - Magnetic recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording device that does not depend on the carrying speed and can hold the recording density constant. SOLUTION: The magnetic recording device for magnetic recording onto a magnetic recording medium 1 being carried is provided with a detecting means 2 for detecting the feed speed of the magnetic recording medium 1, and a control means 3 for correcting the writing pulse of the magnetic recording to a specified value according to the carrying speed acquired from the detecting means 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus for performing magnetic recording on a magnetic recording medium such as a magnetic card in a magnetic card issuing machine or the like.

[0002]

2. Description of the Related Art Magnetic recording media are magnetic cards such as credit cards, cash cards, prepaid cards,
It is widely and generally used for tickets and the like. Magnetic recording on a magnetic recording medium is performed by modulating binary data (binary information) of “1” and “0” with a modulator and applying the obtained square wave signal to a magnetic head. There are various modulation methods, that is, various methods for associating binary information "1" and "0" with magnetization, and the RZ method, the NRZ-1 method, the FM method, and the like are often used. As shown in FIG. 4, in a signal of the FM system, when the value of data (bit) is "1", magnetization reversal occurs.

As shown in FIG. 5, when magnetic recording is performed, that is, when the magnetic recording medium 1 is magnetized, a fixed number of "0" data strings before and after the recording data 14 are usually written. (Dummy data 15). In this case, the recorded data 14
The data string of “0” written before
a, a data string of "0" to be written later is called a postamble 15b. The preamble 15a and the postamble 15b are read prior to the reading of the recording data 14 which is originally required, and are added for obtaining the timing (synchronization) of reading the necessary recording data 14 and for obtaining the signal level. is there.

As shown in FIG. 6, the magnetic card issuing machine comprises a magnetic recording means 11a, a magnetic reading means 11b, a comparing means (not shown), a conveying means 6, and the like. And in the magnetic card issuing machine, in order to guarantee the magnetic recording quality,
After the magnetic recording is performed by the magnetic recording unit 11a, the magnetic recording medium 1 is transported to the magnetic reading unit 11b by the transport unit 6, the magnetic data is read by the magnetic reading unit 11b, and the read data is compared with the data to be written. By means of comparison, it is verified that the data has been written correctly, and each is sorted and stored.

At the same time, in order to improve the magnetic recording quality, in addition to the above-described determination as to whether the data is correct,
In some cases, it is determined whether or not the level of the data read by the magnetic reading unit 11b is within a predetermined range, and whether or not the data writing density is within a predetermined range.

Next, the operation when magnetic recording is performed by the magnetic card issuing machine will be described. With a magnetic card issuing machine,
The position of the magnetic recording medium 1, which is a magnetic card, is detected by a detecting means 2 (in FIG. 6, composed of an LED 9 and a phototransistor 10) composed of a photo interrupter or the like mounted on the transport path. The control means (not shown) including a CPU and the like is a magnetic recording medium 1 which is a magnetic card.
After the detection, the motor of the transport device 6 rotates by a predetermined number of rotations, and after the magnetic recording medium 1 reaches a predetermined position, a magnetic output is performed to the magnetic recording means 11a, and the data is transmitted. Magnetic recording is performed on the magnetic recording medium 1.

Here, the conveying means 6 is composed of a driving roller 7 driven by a motor and a driven roller 8 for holding the tension, and when the driving roller 7 is worn, the driving roller 7 has a circular shape. Since the circumference is short, it is easily assumed that the transport speed is low. When the transport speed is reduced, the write pulse of the magnetic card issuing machine is constant, so that the interval between the magnetic data written by modulation is narrower than in the early days. For example, the initial diameter of the drive roller 7 is φ20 mm, and the diameter of
Assuming that the abrasion contributes 100% to the transport speed, the transport speed is reduced by 5%, and the width of the written data is reduced by 5% (the density is increased).

In this case, if the RZ system and the NRZ-1 system,
In the case of the FM method, synchronization can be obtained from the clock pulse reproduced from the data itself from the simultaneously recorded synchronization clock pulse, so that the data can be read even if the width of the data becomes narrow. However, generally, it is not preferable that the write data width is reduced because the read pulse density is increased, that is, the read voltage is reduced in a situation where the magnetization reversal can frequently occur within a short time.

On the other hand, when the transport speed is reduced, the control means (not shown) including a CPU and the like delays the arrival of the magnetic recording medium 1 as a magnetic card at the recording start position on the transport path. , The recording start position of the preamble 15a is shifted forward. That is, as shown in FIGS. 5 and 6, the distance L from the end of the magnetic recording medium 1 which is a magnetic card to the write start position becomes shorter as the transport speed becomes slower. The width becomes narrower and the recording density becomes higher.

When a magnetic recording is read by a card reader, the first part of the recorded preamble 15a is at the end of the card where the transport speed is not stable at the time of recording, and the adhesion between the magnetic head and the card is poor. It is common to skip over. Normally, the number of preambles 15a is large enough to be sufficiently synchronized to cause little problem. However, when a large amount of preambles 15a cannot be obtained, for example, a large amount of preambles 15a may not be recorded due to a large amount of recording data 14 (user data) to be originally recorded, a small card, a short writing range, or the like. In this case, there is a possibility that the card reader cannot synchronize with the preamble 15a, cannot recognize the start code, and cannot read the deviation of the recording start position, thereby causing a serious situation.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve all the problems in the prior art described above, and an object of the present invention is to keep the recording density constant irrespective of the transport speed. It is to provide a magnetic recording device which can be used.

[0012]

According to a first aspect of the present invention, there is provided a magnetic recording apparatus for performing magnetic recording on a magnetic recording medium to be conveyed, comprising: detecting means for detecting a conveying speed of the magnetic recording medium; And control means for correcting the write pulse for magnetic recording to a specified value based on the transport speed acquired from the detection means.

Therefore, in this case, if the conveying speed of the magnetic recording medium obtained by the detecting means is slow, the control means corrects the write pulse width for magnetic recording so that the write pulse width becomes longer by that amount. Is done.
Therefore, even if the transport speed of the magnetic recording medium changes, the magnetic recording density can be kept constant.

According to a second aspect of the present invention, there is provided a magnetic recording apparatus comprising:
In a magnetic recording apparatus that performs magnetic recording on a conveyed magnetic recording medium, a detecting unit that detects a conveying speed of the magnetic recording medium, and corrects a current conveying speed to a specified conveying speed based on the conveying speed obtained from the detecting unit. Control means for performing the operation.

Accordingly, in this case, if the transport speed of the magnetic recording medium obtained by the detecting means is slow, the transport speed is corrected by the control means so that the transport speed becomes higher by that amount, and the prescribed transport speed is obtained. Therefore, the magnetic recording medium is conveyed at a constant speed, the magnetic recording density can be kept constant, and the displacement of the recording position can be prevented.

According to a third aspect of the present invention, there is provided a magnetic recording apparatus comprising:
The magnetic recording apparatus according to claim 1 or 2, further comprising storage means for accumulating and storing the transport speed of each magnetic recording medium obtained from the detection means.

Therefore, in this case, in particular, since the transport speed for each magnetic recording medium obtained from the detecting means is accumulated and stored in the storage means, an average value is obtained at regular intervals from the cumulative value of the transport speed. By adjusting the transport speed to that speed, even if a sudden change in the transport speed occurs, the transport speed does not greatly change, and useless changes in the transport speed can be suppressed.

According to a fourth aspect of the present invention, there is provided a magnetic recording apparatus comprising:
3. The magnetic recording apparatus according to claim 1, further comprising a storage unit configured to store an average transport speed, which is a value obtained by averaging the transport speed of each magnetic recording medium acquired by the detection unit for a predetermined number of sheets. And

Therefore, in this case, in particular, an average transport speed, which is a value obtained by averaging the transport speeds of the respective magnetic recording media obtained by the detecting means for a predetermined number of sheets, is stored in the storage means.
At this time, the accumulated number of sheets is also stored, but it is not necessary to sequentially store and store the transport speed itself, so that storage space can be saved, and, as described above, sudden transport Even if the speed changes, the transfer speed does not greatly change, and useless changes in the transfer speed can be suppressed.

According to a fifth aspect of the present invention, there is provided a magnetic recording apparatus comprising:
3. The magnetic recording apparatus according to claim 1, wherein the total sum of the transport speeds of the respective magnetic recording media obtained by the detecting means, the cumulative number of magnetic recording media, and the product of the cumulative number at a certain time and the transport speed. A storage means for storing the sum is provided.

Therefore, in this case, in particular, the total sum of the transport speeds of the respective magnetic recording media obtained by the detecting means, the cumulative number of magnetic recording media, and the total sum of the product of the cumulative number and the transport speed at a certain time are stored. Since these values are stored by means, a highly accurate transport speed can be obtained from these values by the least squares method, and even if a sudden change in the transport speed occurs, a large change in the transport speed occurs. It does not occur, and a useless change in the transport speed can be suppressed.

According to a sixth aspect of the present invention, there is provided a magnetic recording apparatus comprising:
The magnetic recording apparatus according to any one of claims 1 to 5, further comprising a printing means for printing on a magnetic recording medium having a visible print recording layer.

Therefore, in this case, in particular, since printing can be performed on the visible print recording layer of the magnetic recording medium by the printing means, whether or not the transport speed or the width of the write pulse has been corrected is printed on the visible print recording layer. By letting
This can be clearly displayed.

[0024]

FIG. 1 shows an embodiment corresponding to claim 1 of the present invention. A magnetic recording apparatus according to this embodiment performs magnetic recording on a magnetic recording medium 1 to be conveyed. A recording apparatus comprising: detecting means 2 for detecting a transport speed of a magnetic recording medium 1; and control means 3 for correcting a write pulse for magnetic recording to a specified value based on the transport speed obtained from the detecting means 2. It is.

The magnetic recording apparatus of this embodiment is a magnetic card issuing machine, and its overall configuration is shown in FIG. 6. The configuration is as described in the above-mentioned prior art. Is omitted. The magnetic recording medium 1 is a magnetic card such as a credit card, a cash card, a prepaid card, a ticket, and the like. Magnetic recording medium 1
Is conveyed by a conveying means 6, and the conveying means 6 is constituted by a driving roller 7 driven by a motor and a driven roller 8 for holding tension, and the driving roller 7 and the driven roller 8 The magnetic recording medium 1, which is a magnetic card, is sandwiched and transported therebetween. At this time, each drive roller 7 is interlocked via a timing belt, and all rotate at a constant speed.

The detecting means 2 comprises an LED 9 and a phototransistor 10, and the LED 9 and the phototransistor 10
When the magnetic recording medium 1, which is a magnetic card, is conveyed and blocked between the two, the output of the phototransistor 10 is turned off. The magnetic recording means 11a is for writing and recording magnetic data on the magnetic recording medium 1 which is a magnetic card, and the magnetic reading means 11b is for reading (verifying) the magnetic data recorded on the magnetic recording medium 1. The magnetic recording means 11a and the magnetic reading means 11b are magnetic heads,
Head tension roller so as to face both magnetic heads
The magnetic recording medium 1 is disposed while being nipped and conveyed between the head tension roller 12 and the magnetic head.
The magnetic data is read and written in the.

In addition, the magnetic recording apparatus of this embodiment includes:
The control means 3 including a CPU, a ROM and an RA shown in FIG.
A storage unit 4 such as M, a modulation unit 13, a demodulation unit (not shown), and the like are provided.

Next, the procedure for issuing a normal magnetic card will be described. The control means 3 transmits an electric signal to the transport means 6 in order to transport the magnetic recording medium 1 at a transport speed predetermined in design. Then, the transporting unit 6 starts transporting the magnetic recording medium 1, and the detecting unit 2 detects the magnetic recording medium 1.
When it is detected that has reached a predetermined position, the detection means 2 transmits the signal to the control means 3. The control means 3 which has received the signal transmits the "0" and "1" signals (see FIG. 4) of the magnetic recording data which are determined in advance or instructed from an external control device to the modulation unit 13. This "1"
The binary information "0" has a preamble 15a and a postamble 15b in addition to the original recording data 14 (FIG. 5).
reference). The data includes a start code and an end code, and may include a direction determination code, an error code, and the like as necessary.

The modulating section 13 outputs "0" and "1" from the control means 3.
The signal is modulated and transmitted to the magnetic recording means 11a as a modulated signal. The magnetic recording means 11a converts the input electric signal into a magnetic signal, and sequentially performs magnetic recording on the magnetic recording medium 1 carried by the carrying means 6. Here, the modulation unit 13
Is separated from the CPU serving as the control means 3, but if the modulation signal can be generated in the control means 3 (CPU), the modulation section 13 becomes unnecessary. However, in this case, a load is imposed on the CPU, so that the configuration is usually separated.

In the magnetic recording apparatus of this embodiment, the transport speed can be detected by using the sensor (LED 9 and phototransistor 10) as the detecting means 2. That is, the sensor is disposed on the transport path, and the transport speed can be calculated from the time during which the magnetic recording medium 1, which is a magnetic card, shields the sensor from light. The control means 3 compares the calculated transport speed with the specified transport speed. If the transport speed is slow, the control unit 3 increases the width of the magnetic pulse accordingly.

Therefore, in the magnetic recording apparatus of this embodiment, if the transport speed of the magnetic recording medium 1 obtained by the detecting means 2 is low, the control means 3 controls the writing pulse width of the magnetic recording to be correspondingly long. The write pulse is corrected to a specified value. Therefore, even if the transport speed of the magnetic recording medium 1 changes, the magnetic recording density can be kept constant. However, in the magnetic recording apparatus of the embodiment, the deviation of the recording start position is not prevented.

Further, in the magnetic recording apparatus of this embodiment, since the allowable amount of wear of the drive roller 7 can be increased, the life of the drive roller 7 is extended. In addition, the recording density of the magnetic card, which is the magnetic recording medium 1, does not become lower than the design value, so that the magnetic output does not decrease, and it is less likely to be affected by dirt adhering when used in the market. Becomes

FIG. 2 shows another embodiment corresponding to the second aspect of the present invention.
In a magnetic recording apparatus for performing magnetic recording on a magnetic recording medium 1 to be conveyed, a detecting unit 2 for detecting a conveying speed of the magnetic recording medium 1 and a current conveying speed based on the conveying speed obtained from the detecting unit 2 are defined. Control means 3 for correcting to transport speed
And with. In this case, if the transport speed calculated by the control means 3 is lower than a prescribed value, the rotation speed of the motor for rotating the drive roller 7 of the transport means 6 is controlled to increase accordingly. If it is a stepper motor, the number of pulses per unit time (ie frequency)
, It is possible to increase the transport speed (the number of rotations).

Therefore, in the magnetic recording apparatus of this embodiment, if the transport speed of the magnetic recording medium 1 obtained by the detecting means 2 is slow, the control means 3 corrects and regulates the transport speed so that the transport speed becomes faster. The value is taken as the transport speed. Therefore, the magnetic recording medium 1 is conveyed at a constant speed, the magnetic recording density can be kept constant, and the displacement of the recording position can be prevented. Except for this, the configuration is the same as in the above embodiment, and the same operation and effect as in the above embodiment are exerted.

In addition, since such a control method controls the sequential transport speed, the control method does not depend on wear, such as the locking of the drive roller 7 or the slip of the magnetic card as the magnetic recording medium 1. Even in the case where the generated transport speed is reduced, there is a possibility that the transport speed is controlled and changed.

Therefore, the magnetic recording apparatus of the embodiment shown in FIGS. 1 and 2 is provided with storage means 4 for accumulating and storing the transport speed of each magnetic recording medium 1 obtained from the detection means 2. The magnetic recording device corresponds to claim 3 of the present invention. The storage unit 4 includes a RAM, a ROM, and the like, and sequentially stores and stores the transport speed calculated by the control unit 3. Therefore, in this case, since the transport speed for each magnetic recording medium 1 obtained from the detection unit 2 is accumulated and stored in the storage unit 4, an average value is obtained at regular intervals from the accumulated value of the transport speed. By adjusting the transport speed to that speed, even if a sudden change in the transport speed occurs, the transport speed does not greatly change, and wasteful changes in the transport speed can be suppressed.

However, in the above case, a large storage capacity is required because the transfer speed is sequentially stored in the storage means 4, and if a limited storage capacity is used, a sudden change in the transfer speed contributes. The part becomes large. Therefore, it is preferable that the storage unit 4 stores an average transport speed which is a value obtained by averaging the transport speed of each magnetic recording medium 1 obtained by the detection unit 2 for a predetermined number of sheets. By doing so, a magnetic recording apparatus according to claim 4 of the present invention is obtained.

Therefore, in this case, the average transport speed, which is a value obtained by averaging the transport speed of each magnetic recording medium 1 obtained by the detection unit 2 for a predetermined number of sheets, is stored in the storage unit 4, and at this time, Will also be remembered,
Since it is not necessary to sequentially store and store the transport speed itself, it is possible to save storage space and, as described above, to cause a large change in the transport speed even if a sudden change in the transport speed occurs. However, it is possible to suppress a useless change in the transport speed.

The storage means 4 stores the total sum of the transport speeds of the respective magnetic recording media 1 obtained from the detection means 2,
The magnetic recording device according to claim 5 of the present invention may store the cumulative number of magnetic recording media 1 and the sum of the product of the cumulative number at a certain time (ticket issuing time) and the transport speed. Become. Therefore, in this case, the detecting means 2
The storage unit 4 stores the total sum of the transport speeds of the respective magnetic recording media 1 obtained from the above, the cumulative number of the magnetic recording media 1, and the sum of the product of the cumulative number and the transport speed at a certain time (ticket issuing time). Therefore, a highly accurate transport speed can be obtained from these values by the least squares method.
Even if a sudden change in the transport speed occurs, the transport speed does not greatly change, and wasteful changes in the transport speed can be suppressed.

FIG. 3 shows still another embodiment corresponding to claim 6 of the present invention. In the magnetic recording apparatus of this embodiment, printing is performed on a magnetic recording medium 1 having a visible print recording layer. Means 5 are provided. Therefore, in this case, the printing means 5 not only prints the general visible information required for the card on the visible print recording layer, but also prints information as to whether the transport speed or the width of the write pulse has been corrected. The information can also be printed on the recording layer, so that the information can be clearly displayed.
The other configuration is the same as that of each of the above embodiments, and the same operation and effect as those of each of the above embodiments are exerted.

[0041]

As described above, in the magnetic recording apparatus according to the first aspect of the present invention, if the transport speed of the magnetic recording medium is slow, the control means controls the write pulse width of magnetic recording to be correspondingly longer. Since the correction is performed, the magnetic recording density can be kept constant even if the transport speed of the magnetic recording medium changes.

In the magnetic recording apparatus according to the second aspect of the present invention, if the transport speed of the magnetic recording medium is low, the magnetic recording medium is corrected by the control means so as to increase the transport speed accordingly. Is transported at a constant speed, the magnetic recording density can be kept constant, and the displacement of the recording position can be prevented.

Further, in the magnetic recording apparatus according to the third aspect of the present invention, even if a sudden change in the transport speed occurs, the transport speed does not greatly change, and the transport speed does not needlessly change. Can be suppressed.

In the magnetic recording apparatus according to the fourth aspect of the present invention, in particular, the storage space is saved, and as in the above case, the transport speed does not greatly change, and the transport speed does not needlessly change. Can be suppressed.

Further, in the magnetic recording apparatus according to the fifth aspect of the present invention, it is possible to obtain a high-accuracy transport speed by the least-squares method. However, it is possible to suppress a useless change in the transport speed.

In the magnetic recording apparatus according to the sixth aspect of the present invention, in particular, whether or not the transport speed or the width of the writing pulse has been corrected can be clearly displayed by visually printing. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic recording apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a magnetic recording apparatus according to another embodiment.

FIG. 3 is a block diagram showing a means configuration of a magnetic recording apparatus according to yet another embodiment.

FIG. 4 is a waveform chart showing signals of an FM system.

FIG. 5 is a conceptual plan view showing a normal recording state of a magnetic card as a magnetic recording medium.

FIG. 6 is a schematic diagram showing the overall configuration of a transport path.

FIG. 7 is a conceptual plan view showing an abnormal recording state of a magnetic card as a magnetic recording medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic recording medium 2 Detecting means 3 Control means 4 Storage means 5 Printing means 6 Transport means

Claims (6)

[Claims] In a magnetic recording apparatus for performing magnetic recording on a conveyed magnetic recording medium, a detecting means for detecting a conveying speed of the magnetic recording medium, and a write pulse for magnetic recording based on the conveying speed obtained from the detecting means are provided. A magnetic recording device comprising: a control unit that corrects to a specified value. 2. A magnetic recording apparatus for performing magnetic recording on a magnetic recording medium to be conveyed, a detecting unit for detecting a conveying speed of the magnetic recording medium, and a current conveying speed defined based on the conveying speed obtained from the detecting unit. And a control unit for correcting the transport speed to a predetermined value. 3. The magnetic recording apparatus according to claim 1, further comprising a storage unit that accumulates and stores the transport speed of each magnetic recording medium obtained from the detection unit. 4. The storage device according to claim 1, further comprising storage means for storing an average transport speed, which is a value obtained by averaging the transport speeds of the respective magnetic recording media obtained by the detection unit for a predetermined number of sheets. Magnetic recording device. 5. A total sum of the transport speeds of the respective magnetic recording media obtained by the detecting means, an accumulated number of the magnetic recording media,
3. The magnetic recording apparatus according to claim 1, further comprising storage means for storing a sum of a product of the cumulative number of sheets and a transport speed at a certain time. 6. A printing means for printing on a magnetic recording medium having a visible print recording layer.
6. The magnetic recording device according to any one of 5.