JP6945694B2 - Magnetic tape cartridge, magnetic tape cartridge manufacturing method, magnetic tape cartridge manufacturing device, recording / playback device, and control method - Google Patents

Description

The present disclosure relates to a magnetic tape cartridge, a method for manufacturing a magnetic tape cartridge, a device for manufacturing a magnetic tape cartridge, a recording / reproducing device, and a control method.

Conventionally, a servo pattern is written on a magnetic tape in order to make the recording / reproducing element of the magnetic head follow the data track of the magnetic tape on which magnetic information is recorded. A timing-based method is known as a method of writing this servo pattern on a magnetic tape.

As a technique related to this timing-based method, Patent Document 1 discloses a technique of writing the recording conditions obtained by reading the servo pattern by the servo reproduction element at the time of recording the data on the data track to the data track. ..

Further, Patent Document 2 discloses a magnetic tape including a data track existing between two servo bands and having a data track in which the distance between the two servo bands is less than 200 μm.

Japanese Unexamined Patent Publication No. 2005-327392 Japanese Patent Application Laid-Open No. 2008-542696

By the way, in recent years, the density of magnetic tapes has been increasing, so that the width and spacing of data tracks have become extremely narrow. Further, since it is expected that the density of the magnetic tape will continue to increase in the future, higher accuracy will be required for positioning the magnetic head in the width direction of the magnetic tape.

On the other hand, a servo recording head provided with a plurality of servo bands in a one-to-one correspondence and each having a plurality of servo recording elements for recording a servo pattern has individual differences due to manufacturing errors and the like. In some cases. In this case, if the magnetic head is positioned based on the servo pattern recorded on the servo band without considering this individual difference, there is a problem that the magnetic head may not be positioned accurately. be. However, the techniques described in Patent Documents 1 and 2 do not consider this problem.

The present disclosure has been made in view of the above circumstances, and includes a magnetic tape cartridge capable of accurately positioning a magnetic head, a method for manufacturing a magnetic tape cartridge, a device for manufacturing a magnetic tape cartridge, a recording / reproducing device, and the like. And to provide a control method.

In order to achieve the above object, the magnetic tape cartridge of the present disclosure includes a plurality of servo bands in which a servo pattern is recorded, and a magnetic tape including a data band provided between the servo bands and in which data is recorded. A recording medium in which servo band spacing related information including spacing in a direction corresponding to the width direction of the magnetic tape of adjacent servo recording elements in a plurality of servo recording elements for recording a servo pattern in each of the servo bands is recorded. It has.

In the magnetic tape cartridge of the present disclosure, the servo band spacing related information reproduces the tension of the magnetic tape when recording data in the data band and the adjacent servo patterns in the tape drive when recording data in the data band. The interval in the direction corresponding to the width direction of the servo reproduction element and the interval in the width direction of adjacent servo bands detected when recording data in the data band may be further included.

Further, in the magnetic tape cartridge of the present disclosure, the servo band spacing related information may be recorded on the recording medium corresponding to each of a plurality of different positions along the width direction in the servo pattern.

On the other hand, in order to achieve the above object, the method for manufacturing a magnetic tape cartridge of the present disclosure includes a plurality of servo bands in which a servo pattern is recorded, and a data band provided between the servo bands and in which data is recorded. A method of manufacturing a magnetic tape cartridge including a magnetic tape and a recording medium, in the width direction of the magnetic tapes of adjacent servo recording elements in a plurality of servo recording elements for recording a servo pattern in each of a plurality of servo bands. Information related to the servo band interval including the interval in the direction corresponding to is recorded on the recording medium.

Further, in order to achieve the above object, the magnetic tape cartridge manufacturing apparatus of the present disclosure includes a plurality of servo bands in which a servo pattern is recorded, and a data band provided between the servo bands and in which data is recorded. A device for manufacturing a magnetic tape cartridge including a magnetic tape and a recording medium, in the width direction of the magnetic tapes of adjacent servo recording elements in a plurality of servo recording elements for recording a servo pattern in each of a plurality of servo bands. It is provided with a recording unit that records information related to the servo band interval including the interval in the direction corresponding to the above on a recording medium.

Further, in order to achieve the above object, the recording / reproducing device of the present disclosure includes a plurality of servo bands on which a servo pattern is recorded, and a magnetic tape including a data band provided between the servo bands and in which data is recorded. , A recording medium on which servo band spacing related information including spacing in a direction corresponding to the width direction of the magnetic tape of adjacent servo recording elements in a plurality of servo recording elements for recording a servo pattern in each of the plurality of servo bands is recorded. A magnetic head including a servo reproduction element that reads a servo pattern recorded in a servo band of a magnetic tape cartridge provided with, and a recording / reproduction element that records and reproduces data in a data band, and a servo pattern by the servo reproduction element. From the reading result, the detection unit that detects the distance between adjacent servo bands in the width direction, the distance in the direction corresponding to the width direction of the magnetic tape of the servo recording element included in the servo band spacing related information, and the detection unit detect it. A derivation unit that derives the tension of the magnetic tape according to the difference from the interval, and a control that controls the tension of the magnetic tape to the tension derived by the derivation unit when recording data in the data band by the recording / playback element. It has a department.

In the recording / reproducing device of the present disclosure, the control unit servos the tension derived by the derivation unit, the interval in the direction corresponding to the width direction of the adjacent servo reproduction elements, and the interval detected by the detection unit. Control may be performed to record on the recording medium in addition to the band interval related information.

Further, in order to achieve the above object, the recording / reproducing device of the present disclosure includes a plurality of servo bands in which a servo pattern is recorded, and a magnetic tape including a data band provided between the servo bands and in which data is recorded. , The widthwise spacing of the magnetic tapes of adjacent servo bands detected when recording data in the data band, the tension of the magnetic tape when recording data in the data band, and recording / playback recording data in the data band. A servo reproduction element included in a magnetic head including an element, which includes a recording medium on which servo band interval-related information including an interval in a direction corresponding to the width direction of adjacent servo reproduction elements for reading a servo pattern is recorded. From the magnetic head including the servo reproduction element that reads the servo pattern recorded in the servo band of the magnetic tape cartridge and the recording / reproduction element that records and reproduces the data in the data band, and the reading result of the servo pattern by the servo reproduction element. In the width direction of the detection unit that detects the interval of the adjacent servo bands in the width direction, the interval in the width direction of the adjacent servo bands included in the servo band interval related information, the tension, and the width direction of the adjacent servo reproduction elements. The amount of deviation from the ideal value of the interval in the width direction of the servo band obtained from the interval in the corresponding direction, the interval detected by the detection unit, and the direction corresponding to the width direction of the adjacent servo reproduction elements included in the magnetic head. With a derivation unit that derives the tension of the magnetic tape that minimizes the difference between the interval and the amount of deviation obtained from the tension of the magnetic tape when reproducing the data recorded in the data band by the recording / reproducing element, and the recording / reproducing element. When reproducing the data recorded in the data band, it includes a control unit that controls the tension of the magnetic tape to the tension derived by the extraction unit.

Further, in order to achieve the above object, the control method of the present disclosure includes a plurality of servo bands on which a servo pattern is recorded, a magnetic tape provided between the servo bands and a data band on which data is recorded, and a magnetic tape. A recording medium on which servo band spacing related information including spacing in a direction corresponding to the width direction of the magnetic tape of adjacent servo recording elements in a plurality of servo recording elements for recording a servo pattern in each of the plurality of servo bands is recorded. Magnetics performed by a recording / playback device equipped with a magnetic head that includes a servo reproduction element that reads the servo pattern recorded in the servo band of a magnetic tape cartridge equipped with, and a recording / reproduction element that records and reproduces data in the data band. This is a tape tension control method that detects the interval in the width direction of adjacent servo bands from the reading result of the servo pattern by the servo reproduction element, and the width of the magnetic tape of the servo recording element included in the servo band interval related information. The tension of the magnetic tape is derived according to the difference between the interval corresponding to the direction and the detected interval, and when data is recorded in the data band by the recording / playback element, the tension of the magnetic tape is controlled to the derived tension. To do.

Further, in order to achieve the above object, the control method of the present disclosure includes a plurality of servo bands on which a servo pattern is recorded, a magnetic tape provided between the servo bands and a data band on which data is recorded, and a magnetic tape. The interval in the width direction of the magnetic tapes of adjacent servo bands detected when recording data in the data band, the tension of the magnetic tape when recording data in the data band, and the recording / playback element that records the data in the data band. A recording medium in which servo band spacing-related information including spacing in the direction corresponding to the width direction of adjacent servo playback elements that read a servo pattern is recorded, which is a servo reproduction element included in the magnetic head including the above. The tension of the magnetic tape performed by a recording / playback device equipped with a magnetic head that includes a servo playback element that reads the servo pattern recorded on the servo band of the magnetic tape cartridge and a recording / playback element that records and reproduces data on the data band. It is a control method, and the interval in the width direction of adjacent servo bands is detected from the reading result of the servo pattern by the servo reproduction element, and the interval in the width direction of the adjacent servo bands included in the servo band interval related information, the above tension. , And the amount of deviation from the ideal value of the interval in the width direction of the servo band obtained from the interval in the direction corresponding to the width direction of the adjacent servo reproduction elements, the detected interval, and the above of the adjacent servo reproduction elements included in the magnetic head. The tension of the magnetic tape that minimizes the difference between the interval in the direction corresponding to the width direction and the above-mentioned deviation amount obtained from the tension of the magnetic tape when reproducing the data recorded in the data band by the recording / reproducing element is derived. When the data recorded in the data band is reproduced by the recording / reproducing element, the tension of the magnetic tape is controlled to the derived tension.

According to the present disclosure, the positioning of the magnetic head can be performed with high accuracy.

It is a block diagram which shows an example of the structure of the magnetic tape cartridge which concerns on embodiment. It is a top view which shows an example of the magnetic tape which concerns on embodiment. It is a top view for demonstrating the positioning process of the magnetic head which concerns on embodiment. It is a figure for demonstrating the process of recording or reproducing data by the recording-reproduction element which concerns on embodiment. It is a figure which shows an example of the structure of the servowriter which concerns on embodiment. It is a figure which shows an example of the structure of the servowriter which concerns on embodiment. It is a block diagram which shows an example of the structure of the measuring device and the recording device which concerns on embodiment. It is a figure for demonstrating the distance between the linear patterns of the servo pattern which concerns on embodiment. It is a figure which shows an example of the servo pattern distance information which concerns on embodiment. It is a figure which shows an example of the servo position calculated from the servo pattern distance information which concerns on embodiment. It is a figure for demonstrating the interval between adjacent gap patterns which concerns on embodiment. It is a figure which shows an example of the servo band interval related information which concerns on embodiment. It is a flowchart which shows an example of the recording process which concerns on embodiment. It is a block diagram which shows an example of the structure of the recording / reproduction system which concerns on embodiment. It is a flowchart which shows an example of the data recording processing which concerns on embodiment. It is a figure which shows an example of the servo band interval related information which concerns on embodiment. It is a flowchart which shows an example of the data reproduction processing which concerns on embodiment. It is a figure which shows an example of an ideal servo pattern and an actual servo pattern.

Hereinafter, examples of embodiments for carrying out the technique of the present disclosure will be described in detail with reference to the drawings.

First, the configuration of the magnetic tape cartridge 10 according to the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the magnetic tape cartridge 10 includes a magnetic tape MT on which information is magnetically recorded, and an RFID (Radio Frequency) as an example of a recording medium capable of reading the recorded information in a non-contact manner by wireless communication or the like. IDentifier) tag 12 is provided. Servo pattern distance information 14 and servo band interval related information 16 are recorded on the RFID tag 12. Details of the servo pattern distance information 14 and the servo band interval related information 16 will be described later.

As shown in FIG. 2, five servo bands SB are formed in the magnetic tape MT along the longitudinal direction of the magnetic tape MT. Further, the five servo bands SB are formed so as to be arranged at equal intervals in the width direction (short direction) of the magnetic tape MT. A data band DB on which data is recorded is formed in each of the five servo bands SB. The number of servo band SBs and data band DBs is not limited to the example shown in FIG. For example, the servo band SB may be three and the data band DB may be two. In the following, when simply described as the longitudinal direction, it means the longitudinal direction of the magnetic tape MT, and when simply described as the width direction, it means the width direction of the magnetic tape MT.

In the servo band SB, a servo pattern SP for positioning the magnetic head H (see FIG. 3) in the width direction is repeatedly formed in the servo band SB in the longitudinal direction. The servo pattern SP includes a linear pattern SP1 formed so as to be inclined by a predetermined angle with respect to the width direction of the servo band SB along the width direction of the servo band SB, and a linear pattern SP2. The linear pattern SP2 is formed non-parallel to the linear pattern SP1 along the width direction of the servo band SB. In the present embodiment, the linear pattern SP2 is formed so as to be line-symmetric with the linear pattern SP1 with respect to a straight line along the width direction of the servo band SB. Although FIG. 2 illustrates an example in which the servo pattern SP includes one set of linear pattern SP1 and linear pattern SP2, the servo pattern SP includes a plurality of sets of linear pattern SP1 and linear pattern SP2. But it may be.

Next, with reference to FIGS. 3 and 4, a process of positioning the magnetic head H with respect to the width direction of the magnetic tape MT on which the above-mentioned servo pattern SP is formed will be described.

As shown in FIG. 3, the magnetic head H includes a servo reproduction element SRD that reproduces by reading the servo pattern SP recorded in the servo band SB, and a recording / reproduction element RWD that records and reproduces data on the data track DT. including. In the following, when the positions of the magnetic head H, the servo reproduction element SRD, and the recording / reproduction element RWD are simply described, they mean the positions along the width direction of the magnetic tape MT, respectively. ..

In the present embodiment, when the magnetic tape MT travels in a predetermined traveling direction (for example, from right to left in FIG. 3), the servo reproduction element SRD of the magnetic head H moves to a predetermined position in the width direction of the servo band SB. The magnetic head H is positioned with respect to the magnetic tape MT by being positioned at. In the following, when simply referred to as the traveling direction, it means the traveling direction of the magnetic tape MT.

The servo reproduction element SRD detects the linear pattern SP1 and the linear pattern SP2 when the linear pattern SP1 and the linear pattern SP2 pass the detection position by the servo reproduction element SRD. At this time, the magnetic head H is positioned at a position where the detection intervals of the linear pattern SP1 and the linear pattern SP2 are predetermined values. As a result, the recording / reproducing element RWD of the magnetic head H follows a predetermined data track DT.

Further, as shown in FIG. 4, a plurality of recording / reproducing elements RWD (32 in the example of FIG. 4) are provided, and it is possible to record or reproduce data on a plurality of data track DTs at the same time. .. In the following, the position of the magnetic head H when recording or reproducing data with respect to a predetermined data track DT is referred to as a “lap position”.

Next, the configuration of the servo writer SW that records the servo pattern SP in each servo band SB of the magnetic tape MT according to the present embodiment will be described with reference to FIGS. 5A and 5B.

As shown in FIG. 5A, the servo writer SW includes a transmission reel SW1, a take-up reel SW2, a drive device SW3, a pulse generation circuit SW4, a control device SW5, and a servo signal writing head WH. The servo writer SW also includes a power supply device (not shown), a cleaning device for cleaning the magnetic tape MT, a verification device for inspecting the servo pattern SP recorded on the magnetic tape MT, and the like.

In the transmission reel SW1, a magnetic tape MT cut to the product width from a wide web material before writing the servo pattern SP is set by a large-diameter pancake, and the magnetic tape MT is set when writing the servo pattern SP. send out. The magnetic tape MT sent out from the sending reel SW1 is guided by the guide SW6 or the like and conveyed to the servo signal writing head WH. Then, the magnetic tape MT on which the servo pattern SP is recorded in each servo band SB by the servo signal writing head WH is guided by the guide SW6 or the like and conveyed to the take-up reel SW2. The take-up reel SW2 is rotationally driven by the drive device SW3, and winds up the magnetic tape MT on which the servo pattern SP is recorded.

The drive device SW3 is a device for rotationally driving the take-up reel SW2, and is a motor (not shown), a motor drive circuit for supplying a current to the motor, and a gear for connecting the motor shaft and the take-up reel SW2. Etc. are provided. The drive device SW3 generates a motor current by a motor drive circuit based on a motor current signal from the control device SW5, supplies this motor current to the motor, and further supplies the rotational driving force of the motor via a gear to the take-up reel SW2. The take-up reel SW2 is rotationally driven by transmitting to.

The pulse generation circuit SW4 is a circuit that supplies a recording pulse current to a plurality of coils C (see FIG. 5B) provided in the servo signal writing head WH based on a pulse control signal from the control device SW5, and the plurality of coils. Each C is provided independently. Specifically, the pulse generation circuit SW4 alternately generates pulse currents having positive or negative polarities and zero currents based on the pulse control signal from the control device SW5 to generate the servo pattern SP for each servo. Record at a predetermined position on the band SB. The recording pulse current is a current value sufficient to magnetize the magnetic layer of the magnetic tape MT by the leakage flux from the gap pattern G (see FIG. 5B), and the characteristics of the coil C of the servo signal writing head WH and the like. Is set in consideration of.

As shown in FIG. 5B, the servo signal writing head WH includes a linear gap pattern G provided at a position corresponding to each servo band SB, and the servo pattern SP is attached to the magnetic tape MT by each gap pattern G. Record on the servo band SB. One linear pattern of the gap pattern G is tilted corresponding to the angle of the linear pattern SP1, and the other linear pattern is made non-parallel to the one linear pattern corresponding to the linear pattern SP2. There is. The gap pattern G is an example of a servo recording element that records the servo pattern SP on the servo band SB.

Further, the head core HC is independent for each gap pattern G, and a coil C is wound around each of these head core HCs. Then, each pulse generation circuit SW4 connected to each coil C converts the data for distinguishing the individual servo band SB encoded by the control device SW5 into a pattern of the recorded pulse current, and the recorded pulse current according to this pattern. Is supplied to the coil C. As a result, unique identification information corresponding to each servo band SB is embedded in the servo pattern SP of each servo band SB. The head core HC does not have to be independent for each gap pattern G. For example, one head core HC may be provided corresponding to all the gap patterns G. In this case, the servo pattern SP is collectively recorded in each servo band SB by one recording pulse current.

Next, with reference to FIG. 6, the configuration of the measuring device 20 and the recording device 22 for recording the servo pattern distance information 14 and the servo band interval related information 16 on the RFID tag 12 of the magnetic tape cartridge 10 will be described. Examples of the measuring device 20 include an MFM (Magnetic Force Microscope), an SEM (Scanning Electron Microscope), a laser microscope, and the like. As shown in FIG. 6, the recording device 22 includes a control unit 24 including a CPU (Central Processing Unit) and a memory as a temporary storage area, and a recording unit 26 for recording information on the RFID tag 12 in a non-contact manner. ..

The measuring device 20 measures the servo signal writing head WH of the servo writer SW, and outputs a signal corresponding to the distance in the direction corresponding to the longitudinal direction in the two linear patterns of each gap pattern G. Further, the measuring device 20 outputs a signal corresponding to the interval in the direction corresponding to the width direction of the adjacent gap patterns G.

The control unit 24 of the recording device 22 acquires the signal output from the measuring device 20. Further, as shown in FIG. 7, the control unit 24 derives a distance D in the direction H1 corresponding to the longitudinal direction in the two linear patterns of each gap pattern G by using the acquired signal as an example. The control unit 24 derives the distance D for each corresponding position (hereinafter, referred to as “servo position”) of the servo pattern SP along the direction H2 corresponding to the width direction. This servo position corresponds to the lap position described above. Then, the control unit 24 controls the recording unit 26, associates the servo band SB number corresponding to each gap pattern G with the servo position, and uses the derived distance D as the servo pattern distance information 14 on the RFID tag 12. Record.

FIG. 8A shows an example of the servo pattern distance information 14. As shown in FIG. 8A, the servo pattern distance information 14 includes a distance D corresponding to each combination of the servo band SB number and the servo position. In the example of FIG. 8A, the azimuth angle is 12 °, the length in the width direction is 93 μm, and the linear pattern SP1 and the line at the midpoint position in the width direction (position at 46.5 μm (= 93/2)). The distance D at each servo position is shown on the assumption that the servo pattern SP has a longitudinal distance of 38 μm from the shape pattern SP2.

From this distance D, which servo position the distance D corresponds to is calculated according to the following equation (1). The "distance at the midpoint" in the equation (1) is the distance between the linear pattern SP1 and the linear pattern SP2 at the midpoint position in the width direction of the servo pattern SP in the longitudinal direction (in the example of FIG. 8A, in the example of FIG. 8A). 38 μm). That is, in the equation (1), the servo position is calculated by the distance in the width direction with reference to the position of the midpoint in the width direction of the servo pattern SP.

FIG. 8B shows the distance in the width direction with respect to the position of the midpoint in the width direction of the servo pattern SP calculated by the equation (1) for each servo position shown in FIG. 8A.

Further, as shown in FIG. 9 as an example, the control unit 24 derives the interval K1 in the direction H2 of the corresponding servo positions of the adjacent gap patterns G by using the acquired signal. The control unit 24 derives the interval K1 for each combination of adjacent gap patterns G and for each servo position. Then, the control unit 24 controls the recording unit 26, associates the number of the data band DB corresponding between the adjacent gap patterns G, and the lap position corresponding to the servo position, and derives the interval K1 from the servo band. It is included in the interval related information 16 and recorded on the RFID tag 12.

FIG. 10 shows an example of the servo band interval related information 16. As shown in FIG. 10, the servo band interval related information 16 includes the interval K1 corresponding to each combination of the data band DB number and the lap position.

Next, referring to FIG. 11, the flow of the recording process of recording the servo pattern SP on the magnetic tape MT of the magnetic tape cartridge 10 and recording the servo pattern distance information 14 and the servo band interval related information 16 on the RFID tag 12. An example will be described.

In step S10 of FIG. 11, as described above, the servo writer SW servos each servo band SB of the magnetic tape MT by the corresponding gap pattern G of the servo signal writing head WH under the control of the control device SW5. Record the pattern SP.

In step S12, as described above, the measuring device 20 measures the servo signal writing head WH of the servo writer SW used in the process of step S10, and outputs a signal of the measurement result. In step S14, the control unit 24 of the recording device 22 derives the distance D by using the signal output by the process of step S12 as described above. Then, the control unit 24 controls the recording unit 26, associates the servo band SB number corresponding to each gap pattern G with the servo position, and uses the derived distance D as the servo pattern distance information 14 on the RFID tag 12. Record.

In step S16, the control unit 24 of the recording device 22 derives the interval K1 using the signal output by the process of step S12 as described above. Then, the control unit 24 controls the recording unit 26, associates the number of the data band DB corresponding between the adjacent gap patterns G, and the lap position corresponding to the servo position, and derives the interval K1 from the servo band. It is included in the interval related information 16 and recorded on the RFID tag 12. When the process of step S16 is completed, the main recording process is completed.

The processing order of this recording process is not limited to the example shown in FIG. For example, the process of step S10 may be executed after the processes of steps S12 to S16 are executed. By the above processing, the servo pattern SP is recorded on the servo band SB, and the magnetic tape cartridge 10 on which the servo pattern distance information 14 and the servo band interval related information 16 are recorded on the RFID tag 12 is shipped.

Next, with reference to FIG. 12, the configuration of the recording / reproducing system 30 for recording and reproducing data on the shipped magnetic tape cartridge 10 will be described.

As shown in FIG. 12, the recording / playback system 30 includes a tape library 40. The tape library 40 includes a plurality of slots 42 and a plurality of (two in this embodiment) tape drives 44. In the following, when distinguishing between the two tape drives 44, an alphabet is added to the end of the reference numerals such as "tape drive 44A" and "tape drive 44B". Further, in the present embodiment, a case where data is recorded in the magnetic tape cartridge 10 by the tape drive 44A and the data recorded in the magnetic tape cartridge 10 is reproduced by the tape drive 44B will be described. The tape drive 44 is an example of a recording / playback device.

The magnetic tape cartridge 10 is stored in the slot 42. The magnetic tape cartridge 10 taken out from the slot 42 is loaded into the tape drive 44. Further, after the recording or reproduction of data on the magnetic tape MT of the magnetic tape cartridge 10 loaded in the tape drive 44 is completed, the magnetic tape cartridge 10 is unloaded from the tape drive 44 and then stored in the slot 42.

The tape drive 44 includes a control unit 46, a read / write unit 48, and a magnetic head H. The magnetic head H includes a plurality of recording / reproducing elements RWD and a plurality of (two in the present embodiment) servo reproduction elements SRD corresponding to each of adjacent servo bands SB. The reading / writing unit 48 reads the information recorded on the RFID tag 12 built in the magnetic tape cartridge 10 in a non-contact manner under the control of the control unit 46, and outputs the read information to the control unit 46. Further, the reading / writing unit 48 records the information on the RFID tag 12 in a non-contact manner under the control of the control unit 46. An example of the read / write unit 48 is an RFID reader / writer.

The control unit 46 includes a PLD (Programmable Logic Device), a memory as a temporary storage area, a non-volatile storage unit, and the like. The storage unit of the control unit 46 stores the interval in the direction corresponding to the width direction of the servo reproduction element SRD included in the tape drive 44 provided with the control unit 46. In the following, the interval between the servo reproduction element SRD of the tape drive 44A is referred to as "interval h1", and the interval between the servo reproduction element SRD of the tape drive 44B is referred to as "interval h2".

Next, with reference to FIG. 13, the flow of the data recording process in which the recording / reproducing system 30 records data in the magnetic tape cartridge 10 will be described. The data recording process shown in FIG. 13 is executed, for example, when the data to be recorded is input to the control unit 46 of the tape drive 44A. Here, it is assumed that the data recording process is executed with the magnetic tape cartridge 10 loaded in the tape drive 44A.

In step S20 of FIG. 13, the control unit 46 controls the read / write unit 48 to read the servo pattern distance information 14 and the servo band interval related information 16 recorded on the RFID tag 12. Then, the control unit 46 acquires the servo pattern distance information 14 and the servo band interval related information 16 read by the read / write unit 48. In step S22, the control unit 46 controls the magnetic head H and causes the servo reproduction element SRD to read a predetermined number of servo patterns SP recorded in the servo band SB. At this time, the control unit 46 controls the transport mechanism for pulling out the magnetic tape MT so that the tension of the magnetic tape MT becomes a specified tension (for example, 0.55 [N]).

In step S24, the control unit 46 detects the interval in the width direction between the adjacent servo bands SB based on the reading result of step S22. In the following, this interval will be referred to as "interval K2". Specifically, the control unit 46 sets the time interval between the timings at which the linear pattern SP1 and the linear pattern SP2 are read by each servo reproduction element SRD, and the longitudinal length between the linear pattern SP1 and the linear pattern SP2. Convert to distance in direction. Further, the control unit 46 derives the servo position of each servo reproduction element SRD according to the above equation (1) using the converted distance. Then, the control unit 46 detects the interval K2 by adding the difference in the servo positions of the derived servo reproduction elements SRD to the interval h1. The control unit 46 functions as a detection unit by the process of step S24.

In step S26, the control unit 46 is based on the time interval at which the linear pattern SP1 and the linear pattern SP2 read by the process of step S22 are read, and the servo pattern distance information 14 acquired by the process of step S20. , Position the magnetic head H.

In step S28, the control unit 46 derives the tension of the magnetic tape MT based on the interval K1 and the interval K2 according to the following equation (2). _{The Tension write in} Eq. (2) represents the tension of the magnetic tape MT to be derived. Further, the SBP _ref in the equation (2) represents the data band DB positioned by the process of step S26 in the servo band interval related information 16 acquired by the process of step S20 and the interval K1 corresponding to the lap position. _{Further, SBP write} in the equation (2) represents the interval K2 detected by the process of step S24. Further, α in the equation (2) represents the deformation coefficient of the magnetic tape MT. _{Further, the tension ref} in the equation (2) represents the tension of the magnetic tape MT when the servo writer SW records the servo pattern SP on the servo band SB. The control unit 46 functions as a derivation unit by the process of step S28.

_{When recording the data, the deviation amount ΔP write} from the ideal value of the interval K2 of the servo band SB detected by the process of step S24 is obtained by the following equation (3). In the present embodiment, as shown in the equation (2), the magnetism when recording data in the data band DB according to the difference between the interval K1 of the gap pattern G of the servo writer SW and the interval K2 of the servo band SB. The tension of the tape MT is derived. Therefore, the deviation amount ΔP _write can be set to an appropriate value. _{Note that h 1} in the equation (3) is the interval h 1 described above.

The deformation coefficient of the magnetic tape MT in the equations (2) and (3) is, for example, according to the following equation (4), the magnetic tape is 1 [N] per 2.858 [mm] between adjacent servo bands SB. It is calculated as the amount of deformation in the width direction of MT. In Eq. (4), ε _MD represents the strain in the longitudinal direction of the magnetic tape MT, σ represents the stress, and E _MD represents the Young's modulus in the longitudinal direction of the magnetic tape MT. Further, ν in the equation (4) represents Poisson's ratio, and d represents a unit distance (2.858 [mm] in this embodiment). Further, the stress is obtained by using the cross-sectional area obtained from the total thickness and width of the magnetic tape MT. The Young's modulus and total tape thickness in the longitudinal direction of the magnetic tape MT differ depending on the material of the magnetic tape MT such as PA (polyaramid), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate), and are therefore determined according to the material. Be done.

In step S29, the control unit 46 determines whether or not a predetermined termination condition is satisfied. If this determination is a negative determination, the process returns to step S22, and if the determination is affirmative, the process proceeds to step S30. Examples of the termination condition in this case include the condition that the tension derived by the process of step S28 has converged. Further, as the end condition in this case, for example, a condition that all the servo pattern SPs recorded in the servo band SB have been read, a condition that a predetermined number of servo pattern SPs have been read, and the like can be mentioned.

In step S30, the control unit 46 controls the magnetic head H and records the data in the data band DB. At this time, the control unit 46 controls the transport mechanism for pulling out the magnetic tape MT so that the tension of the magnetic tape MT becomes the tension derived by the process of step S28. In step S32, the control unit 46 controls the read / write unit 48, and the tension derived by the process of step S28, the interval K2 detected by the process of step S24, and the servo band interval related information to which the interval h1 is added. 16 is recorded on the RFID tag 12. At this time, the control unit 46 adds the tension, the interval K2, and the interval h1 to the servo band interval related information 16 in association with the number and the lap position of the data band DB in which the data is recorded. When the process of step S32 is completed, the magnetic tape cartridge 10 is unloaded from the tape drive 44A, and the unloaded magnetic tape cartridge 10 is stored in the slot 42. When the process of step S32 is completed, the data recording process is completed.

By the processing of step S32, as shown in FIG. 14, as an example, the tension of the magnetic tape MT at the time of data recording, the interval K2 detected at the time of data recording, and the interval h1 of the servo reproduction element SRD of the tape drive 44A that recorded the data , Added to servo band spacing related information 16.

Next, with reference to FIG. 15, the flow of the data reproduction process in which the recording / reproduction system 30 reproduces the data recorded in the magnetic tape cartridge 10 will be described. The data reproduction process shown in FIG. 15 is executed, for example, when a data reproduction instruction is input to the control unit 46 of the tape drive 44B. Here, it is assumed that the data reproduction process is executed with the magnetic tape cartridge 10 loaded in the tape drive 44B.

In step S40 of FIG. 15, the control unit 46 controls the read / write unit 48 to read the servo pattern distance information 14 and the servo band interval related information 16 recorded on the RFID tag 12. Then, the control unit 46 acquires the servo pattern distance information 14 and the servo band interval related information 16 read by the read / write unit 48. In step S42, the control unit 46 controls the magnetic head H and causes the servo reproduction element SRD to read a predetermined number of servo patterns SP recorded in the servo band SB. At this time, the control unit 46 controls the transport mechanism for pulling out the magnetic tape MT so that the tension of the magnetic tape MT becomes a predetermined tension.

In step S44, the control unit 46 detects the interval K2 in the width direction of the adjacent servo bands SB based on the reading result of step S42, as in step S24. In step S46, the control unit 46 is based on the time interval at which the linear pattern SP1 and the linear pattern SP2 read by the process of step S42 are read, and the servo pattern distance information 14 acquired by the process of step S40. , Position the magnetic head H.

In step S48, the control unit 46 detects the interval K2 and the interval h1 included in the servo band interval related information 16, the tension of the magnetic tape MT at the time of data recording, the interval h2 stored in the storage unit, and the process of step S44. The tension of the magnetic tape MT is derived based on the gap K2. _{The deviation amount ΔP read} from the ideal value of the interval K2 detected by the process of step S44 is expressed by the following equation (5).

_{Appropriate data by minimizing the difference between the amount of deviation ΔP write} during data recording and the amount of deviation ΔP _read during data reproduction (in this embodiment, the amount of deviation ΔP _write and the amount of deviation ΔP _read are equalized). The track DT data is reproduced by the recording / reproducing element RWD. Therefore, in the present embodiment, the control unit 46 derives the tension of the magnetic tape MT according to the following equations (6) obtained from the equations (3) and (5). _{The tension read} in the equation (6) represents the tension of the magnetic tape MT to be derived. _{Further, the tension write} in the equation (6) represents the tension of the magnetic tape MT at the time of data recording included in the servo band interval related information 16. _{Further, SBP write} in the equation (6) represents the interval K2 included in the servo band interval related information 16. Further, the SBP _read in the equation (6) represents the interval K2 detected by the process of step S44. _{Further, h 1} in the equation (6) represents the interval h 1 included in the servo band interval related information 16, and h ₂ represents the interval h 2 stored in the storage unit. Further, α in the equation (6) represents the deformation coefficient of the above-mentioned magnetic tape MT.

In step S49, the control unit 46 determines whether or not a predetermined termination condition is satisfied, as in step S29. If this determination is a negative determination, the process returns to step S42, and if the determination is affirmative, the process proceeds to step S50.

In step S50, the control unit 46 controls the magnetic head H and reproduces the data recorded in the data band DB. At this time, the control unit 46 controls the transport mechanism for pulling out the magnetic tape MT so that the tension of the magnetic tape MT becomes the tension derived by the process of step S48. When the process of step S50 is completed, the magnetic tape cartridge 10 is unloaded from the tape drive 44B, and the unloaded magnetic tape cartridge 10 is stored in the slot 42. When the process of step S50 is completed, the data reproduction process is completed.

As described above, in the present embodiment, the servo band spacing related information 16 recorded on the RFID tag 12 records the spacing K1 in the direction H2 corresponding to the width direction of the magnetic tape MTs of the adjacent gap patterns G. There is. As shown in FIG. 16 as an example, it is ideal that the servo pattern SP is recorded in a straight line, but in reality, it is often curved. On the other hand, in the present embodiment, the magnetic head H can be positioned accurately by controlling the tension of the magnetic tape MT by using the interval K1 at the time of data recording.

Further, according to the present embodiment, when the data is reproduced, the tension of the magnetic tape MT is controlled to be the tension that minimizes the difference between _{the deviation amount ΔP write at the time of data recording and the deviation amount ΔP read} at the time of data reproduction. It is carried out. Therefore, even when the magnetic tape MT is deformed in the width direction due to aging, heat, or the like, the magnetic head H can be positioned with high accuracy.

In the above embodiment, the case where the servo band interval related information 16 is recorded on the RFID tag 12 has been described, but the present invention is not limited to this. For example, the servo band interval related information 16 may be repeatedly recorded over the head portion of the data band DB or the servo band SB, or the entire length. Further, the servo band spacing related information 16 may be recorded on a barcode recorded at a predetermined position on the outer peripheral surface of the magnetic tape cartridge 10. Further, the servo band spacing related information 16 may be recorded in a two-dimensional code such as a QR code (registered trademark) recorded at a predetermined position on the outer peripheral surface of the magnetic tape cartridge 10.

Further, in the above embodiment, the servo band interval related information 16 may be recorded in an external database. In this case, for example, identification information such as a serial number of the magnetic tape cartridge 10 is recorded on an RFID tag 12, a bar code, a two-dimensional code, or the like, and a servo band is stored in the database in association with the identification information of the magnetic tape cartridge 10. A form of recording the interval-related information 16 is exemplified.

Further, in the above embodiment, various information included in the servo band spacing related information 16 may be included in the servo band spacing related information 16 at different positions in the longitudinal direction of the magnetic tape MT.

10 Magnetic tape cartridge 12 RFID tag 14 Servo pattern distance information 16 Servo band spacing Related information 20 Measuring device 22 Recording device 24, 46 Control unit 26 Recording unit 30 Recording / playback system 40 Tape library 42 Slot 44, 44A, 44B Tape drive 48 Reading Writing unit C Coil D Distance DB Data band DT Data track G Gap pattern H Magnetic head H1, H2 Direction HC Head core K1 Interval MT Magnetic tape RWD Recording / playback element SB Servo band SP Servo pattern SP1, SP2 Linear pattern SRD Servo playback element SW Servowriter SW1 Transmission reel SW2 Take-up reel SW3 Drive device SW4 Pulse generation circuit SW5 Control device SW6 Guide WH Servo signal writing head

Claims (10)

A plurality of servo bands on which servo patterns are recorded, and a magnetic tape provided between the servo bands and including a data band on which data is recorded, and
Servo band spacing related information including the spacing in the direction corresponding to the width direction of the magnetic tape of the adjacent servo recording elements in the plurality of servo recording elements for recording the servo pattern is recorded in each of the plurality of servo bands. Recording medium and
Magnetic tape cartridge with. The servo band gap related information, data prior SL direction of intervals corresponding to the width direction of the servo read element for reproducing said servo patterns adjacent in the tape drive for recording data on the data band, and the data band The magnetic tape cartridge according to claim 1, further comprising the interval in the width direction of the adjacent servo bands detected when recording the data. The magnetic tape cartridge according to claim 1 or 2, wherein the servo band spacing-related information is recorded on the recording medium corresponding to each of a plurality of different positions along the width direction in the servo pattern. A method for manufacturing a magnetic tape cartridge including a plurality of servo bands on which a servo pattern is recorded, a magnetic tape provided between the servo bands and including a data band on which data is recorded, and a recording medium.
The servo band spacing related information including the spacing in the direction corresponding to the width direction of the magnetic tape of the adjacent servo recording elements in the plurality of servo recording elements that record the servo pattern in each of the plurality of servo bands is recorded. A method of manufacturing a magnetic tape cartridge for recording on a medium. A device for manufacturing a magnetic tape cartridge including a plurality of servo bands on which a servo pattern is recorded, a magnetic tape provided between the servo bands and including a data band on which data is recorded, and a recording medium.
The servo band spacing related information including the spacing in the direction corresponding to the width direction of the magnetic tape of the adjacent servo recording elements in the plurality of servo recording elements for recording the servo pattern in each of the plurality of servo bands is recorded. A device for manufacturing magnetic tape cartridges that has a recording unit that records on a medium. A plurality of servo bands on which a servo pattern is recorded, a magnetic tape including a data band provided between the servo bands and on which data is recorded, and a plurality of magnetic tapes each of the plurality of servo bands for recording the servo pattern. In the servo band of the magnetic tape cartridge provided with a recording medium in which servo band spacing related information including a spacing in a direction corresponding to the width direction of the magnetic tape of the adjacent servo recording elements in the servo recording element of the above is recorded. A magnetic head including a servo reproduction element that reads the recorded servo pattern and a recording / reproduction element that records and reproduces data for the data band.
From the reading result of the servo pattern by the servo reproduction element, a detection unit that detects the interval in the width direction of the adjacent servo bands, and
The tension of the magnetic tape is derived according to the difference between the interval in the direction corresponding to the width direction of the magnetic tape of the servo recording element included in the servo band interval related information and the interval detected by the detection unit. Derivation part and
And wherein, when data is recorded on the data band, controller for tension thus control derived by the deriving unit of the servo band gap of the magnetic tape by the recording element,
Recording / playback device equipped with. The control unit uses the tension derived by the derivation unit, the interval in the direction corresponding to the width direction of the adjacent servo reproduction elements, and the interval detected by the detection unit as the servo band interval related information. The recording / reproducing device according to claim 6, further controlling recording on the recording medium. A plurality of servo bands on which a servo pattern is recorded, a magnetic tape including a data band provided between the servo bands and on which data is recorded, and the adjacent said one detected when recording data in the data band. A servo reproduction element included in a magnetic head including a spacing in the width direction of the magnetic tape of the servo band, tension of the magnetic tape when recording data in the data band, and a recording / reproduction element for recording data in the data band. A recording medium on which servo band spacing-related information including a spacing in a direction corresponding to the width direction of adjacent servo reproduction elements for reading the servo pattern is recorded, and recording on the servo band of a magnetic tape cartridge. A magnetic head including a servo reproduction element that reads the servo pattern and a recording / reproduction element that records and reproduces data in the data band.
From the reading result of the servo pattern by the servo reproduction element, a detection unit that detects the interval in the width direction of the adjacent servo bands, and
The width of the servo band obtained from the width direction spacing of the adjacent servo bands, the tension, and the spacing in the direction corresponding to the width direction of the adjacent servo reproduction elements included in the servo band spacing related information. The amount of deviation from the ideal value of the directional spacing, the spacing detected by the detection unit, the spacing in the direction corresponding to the width direction of the adjacent servo reproduction elements included in the magnetic head, and the recording / reproduction element. A derivation unit that derives the tension of the magnetic tape that minimizes the difference between the deviation amount obtained from the tension of the magnetic tape when reproducing the data recorded in the data band, and
And wherein when reproducing the data recorded in the data band, controller for tension thus control derived by the deriving unit of the servo band gap of the magnetic tape by the recording element,
Recording / playback device equipped with. A plurality of servo bands on which a servo pattern is recorded, a magnetic tape including a data band provided between the servo bands and on which data is recorded, and a plurality of tapes on which the servo pattern is recorded on each of the plurality of servo bands. On the servo band of the magnetic tape cartridge provided with a recording medium on which servo band spacing related information including a spacing in a direction corresponding to the width direction of the magnetic tape of the adjacent servo recording elements in the servo recording element of the above is recorded. A method for controlling the tension of the magnetic tape, which is executed by a recording / reproducing device including a magnetic head including a servo reproduction element for reading the recorded servo pattern and a recording / reproducing element for recording and reproducing data in the data band. hand,
From the reading result of the servo pattern by the servo reproduction element, the interval in the width direction of the adjacent servo bands is detected.
The tension of the magnetic tape is derived according to the difference between the interval in the direction corresponding to the width direction of the magnetic tape of the servo recording element included in the servo band interval related information and the detected interval.
Wherein when recording data in the data band, a control method for thus controlling the tension derived servo band gap of the magnetic tape by the recording and reproducing device. A plurality of servo bands on which a servo pattern is recorded, a magnetic tape including a data band provided between the servo bands and on which data is recorded, and an adjacent tape tape detected when data is recorded in the data band. A servo reproduction element included in a magnetic head including a spacing in the width direction of the magnetic tape of the servo band, tension of the magnetic tape when recording data in the data band, and a recording / reproduction element for recording data in the data band. A recording medium on which servo band spacing-related information including a spacing in a direction corresponding to the width direction of adjacent servo reproduction elements for reading the servo pattern is recorded, and recording on the servo band of a magnetic tape cartridge. A method for controlling the tension of the magnetic tape, which is executed by a recording / reproducing device including a magnetic head including a servo reproduction element for reading the servo pattern and a recording / reproducing element for recording and reproducing data in the data band. ,
From the reading result of the servo pattern by the servo reproduction element, the interval in the width direction of the adjacent servo bands is detected.
The width of the servo band obtained from the width direction spacing of the adjacent servo bands, the tension, and the spacing in the direction corresponding to the width direction of the adjacent servo reproduction elements included in the servo band spacing related information. The amount of deviation from the ideal value of the directional spacing, the detected spacing, the spacing in the direction corresponding to the width direction of the adjacent servo reproduction elements included in the magnetic head, and the recording / reproduction element are recorded in the data band. The tension of the magnetic tape that minimizes the difference between the deviation amount obtained from the tension of the magnetic tape when reproducing the data is derived.
Wherein when reproducing data recorded on the data band, a control method for thus controlling the tension derived servo band gap of the magnetic tape by the recording and reproducing device.

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