Magnetic tape, manufacturing method of magnetic tape, manufacturing device of magnetic tape, and recording and reproducing system
Provided is a magnetic tape, in which servo patterns, each including a first magnetization region formed to be tilted with respect to a width direction of a servo band by an angle θ along the width direction of the servo band and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, are repeatedly formed in a longitudinal direction of the servo band, the magnetic tape is used in a recording and reproducing system which uses a reproducing element for reproducing the servo pattern, a width of which satisfies W1≤(1/tan θ)×stripe width T of the servo pattern, and the angle θ is greater than 25° and equal to or smaller than 45°.
1. A magnetic tape comprising:
servo patterns repeatedly formed in a longitudinal direction of a servo band, each of the servo patterns including a first magnetization region formed to be tilted with respect to a width direction of the servo band by an angle 0 along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band,
wherein the magnetic tape is used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(1/tanθ)×stripe width T of the servo pattern, and
the angle θ is greater than 25° and equal to or smaller than 45°.
2. The magnetic tape according to claim 1 ,
wherein at least one of a condition that the stripe interval of the servo pattern is 0.6 μm to 2.4 μm or a condition that the number of stripes in the first magnetization region and the second magnetization region is 6 to 14 is satisfied.
3. The magnetic tape according to claim 1 , wherein the magnetic tape is used in a recording and reproducing system which uses the reproducing element for reproducing the servo pattern, the width of which satisfies W 2 ≤(0.5/tanθ)×stripe width T of the servo pattern.
4. The magnetic tape according to claim 1 , wherein a magnetic powder of the magnetic tape is strontium ferrite or barium ferrite.
5. The magnetic tape according to claim 4 , wherein a volume of a particle of the magnetic powder is 900 nm 3 to 1,500 nm 3 .
6. The magnetic tape according to claim 1 ,
wherein a magnetization direction is directed one direction by magnetizing the servo band with direct current in the predetermined one direction in a longitudinal direction, and
the magnetization direction of the first magnetization region and the second magnetization region is directed a direction different from or a direction partially different from the magnetization direction of the servo band.
7. A magnetic tape comprising:
servo patterns repeatedly formed in a longitudinal direction of a servo band, each including a first magnetization region formed to be tilted with respect to a width direction of the servo band by an angle θ along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band,
wherein the magnetic tape is used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(1/tanθ)×stripe width T of the servo pattern, and at least one of a condition that the stripe interval of the servo pattern is 0.6 μm to 2.4 μm, or a condition that the number of stripes in the first magnetization region and the second magnetization region is 6 to 14 is satisfied.
8. The magnetic tape according to claim 7 , wherein the angle θ is greater than 25° and equal to or smaller than 45°.
9. The magnetic tape according claim 7 , wherein the magnetic tape is used in a recording and reproducing system which uses the reproducing element for reproducing the servo pattern, the width of which satisfies W 2 ≤(0.5/tanθ)×stripe width T of the servo pattern.
10. The magnetic tape according to claim 7 , wherein a magnetic powder of the magnetic tape is strontium ferrite or barium ferrite.
11. The magnetic tape according to claim 10 , wherein a volume of a particle of the magnetic powder is 900 nm 3 to 1,500 nm 3 .
12. The magnetic tape according to claim 7 ,
wherein a magnetization direction is directed one direction by magnetizing the servo band with direct current in the predetermined one direction in a longitudinal direction, and
the magnetization direction of the first magnetization region and the second magnetization region is directed a direction different from or a direction partially different from the magnetization direction of the servo band.
13. A manufacturing method of a magnetic tape in which servo patterns are repeatedly formed in a longitudinal direction of a servo band, each of the servo patterns including a first magnetization region formed to be tilted with respect to a width direction of the servo band by an angle 0 along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, the magnetic tape being used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(1/tanθ)×stripe width T of the servo pattern, the method comprising:
recording the servo pattern on the servo band by setting the angle θ to be greater than 25° and equal to or smaller than 45°.
14. A manufacturing device of a magnetic tape, in which servo patterns are repeatedly formed in a longitudinal direction of a servo band, each of the servo patterns including a first magnetization region formed to be tilted with respect to a width direction of the servo band by an angle 0 along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, the magnetic tape being used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(/tanθ)×stripe width T of the servo pattern, the device comprising:
a recording unit that records the servo pattern on the servo band by setting the angle θ to be greater than 25° and equal to or smaller than 45°.
15. A manufacturing method of a magnetic tape, in which servo patterns are repeatedly formed in a longitudinal direction of a servo band, each of the servo patterns including a first magnetization region formed to be tilted with respect to a width direction of a servo band by an angle θ along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, the magnetic tape being used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(1/tanθ)×stripe width T of the servo pattern, the method comprising:
recording the servo pattern on the servo band by satisfying at least one of a condition that the stripe interval of the servo pattern is 0.6 μm to 2.4 μm, or a condition that the number of stripes in the first magnetization region and the second magnetization region is 6 to 14.
16. A manufacturing device of a magnetic tape, in which servo patterns are repeatedly formed in a longitudinal direction of a servo band, each of the servo patterns including a first magnetization region formed to be tilted with respect to a width direction of the servo band by an angle 0 along the width direction of the servo band, and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, the magnetic tape being used in a recording and reproducing system that uses a reproducing element for reproducing the servo pattern, a width of the reproducing element satisfies W 1 ≤(1/tanθ)×stripe width T of the servo pattern, the device comprising:
a recording unit that records the servo pattern on the servo band by satisfying at least one of a condition that the stripe interval of the servo pattern is 0.6 μm to 2.4 μm, or a condition that the number of stripes in the first magnetization region and the second magnetization region is 6 to 14.
17. A recording and reproducing system, comprising:
a magnetic head including a servo signal readout element that reads out a servo pattern recorded on a servo band of the magnetic tape according to claim 1 , and a recording and reproducing element that performs at least one of recording or reproducing of data with respect to a data band of the magnetic tape; and
a control unit which performs positioning of the magnetic head along a width direction of the magnetic tape, in accordance with an interval of a detection of the servo pattern performed by the servo signal readout element, in a case of performing at least one of recording or reproducing of data with respect to the data band.
18. A recording and reproducing system, comprising:
a magnetic head including a servo signal readout element that reads out a servo pattern recorded on a servo band of the magnetic tape according to claim 7 , and a recording and reproducing element that performs at least one of recording or reproducing of data with respect to a data band of the magnetic tape; and
a control unit which performs positioning of the magnetic head along a width direction of the magnetic tape, in accordance with an interval of a detection of the servo pattern performed by the servo signal readout element, in a case of performing at least one of recording or reproducing of data with respect to the data band.