Magnetic tape cartridge, magnetic tape drive, detection method of servo pattern, and program

Patent metadata

Field	Value
Publication number	US-11996128-B2
Application number	US-202218050716-A
Country	US
Kind code	B2
Filing date	Oct 28, 2022
Priority date	Oct 29, 2021
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

A magnetic tape cartridge includes a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and a storage medium that is configured to store servo format information including servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line.

First claim

What is claimed is:

1. A magnetic tape cartridge comprising:
a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction; and
a storage medium that is configured to store servo format information including servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line,
wherein the first imaginary straight line is a straight line along a width direction of the magnetic tape,
the servo pattern is at least one linear magnetization region pair,
the linear magnetization region pair includes a first linear magnetization region which is linearly magnetized, and a second linear magnetization region which is linearly magnetized,
the first linear magnetization region and the second linear magnetization region are inclined in opposite directions with respect to the first imaginary straight line,
the first linear magnetization region has a steeper inclined angle with respect to the first imaginary straight line than the second linear magnetization region, and
the servo pattern inclination information includes information on the inclined angle of the first linear magnetization region with respect to the first imaginary straight line, and information on an inclined angle of the second linear magnetization region with respect to the first imaginary straight line.

2. The magnetic tape cartridge according to claim 1 ,
wherein positions of both ends of the first linear magnetization region and positions of both ends of the second linear magnetization region are aligned in the width direction of the magnetic tape.

3. The magnetic tape cartridge according to claim 2 ,
wherein a total length of the first linear magnetization region is shorter than a total length of the second linear magnetization region.

4. The magnetic tape cartridge according to claim 1 ,
wherein the first linear magnetization region is a set of a plurality of first magnetization straight lines, and
the second linear magnetization region is a set of a plurality of second magnetization straight lines.

5. The magnetic tape cartridge according to claim 1 ,
wherein a geometrical characteristic of the linear magnetization region pair on the magnetic tape corresponds to a geometrical characteristic based on a pair of imaginary linear regions inclined line-symmetrically with respect to the first imaginary straight line in a case in which an entirety of the pair of imaginary linear regions is inclined with respect to the first imaginary straight line by inclining a symmetry axis of the pair of imaginary linear regions with respect to the first imaginary straight line.

6. The magnetic tape cartridge according to according to claim 2 ,
wherein a geometrical characteristic of the linear magnetization region pair on the magnetic tape corresponds to a geometrical characteristic in which positions of both ends of one imaginary linear region of a pair of imaginary linear regions inclined line-symmetrically with respect to the first imaginary straight line and positions of both ends of the other imaginary linear region are aligned in the width direction in a case in which an entirety of the pair of imaginary linear regions is inclined with respect to the first imaginary straight line by inclining a symmetry axis of the pair of imaginary linear regions with respect to the first imaginary straight line.

7. The magnetic tape cartridge according to claim 1 ,
wherein the servo format information includes an ideal waveform signal indicating an ideal waveform of a servo pattern signal which is a result of reading the servo pattern by a servo reading element.

8. The magnetic tape cartridge according to claim 7 ,
wherein the ideal waveform is a waveform determined in accordance with an orientation of the servo reading element on the magnetic tape.

9. The magnetic tape cartridge according to claim 8 ,
wherein the ideal waveform is a waveform determined in accordance with a geometrical characteristic of the servo pattern and the orientation of the servo reading element on the magnetic tape.

10. The magnetic tape cartridge according to claim 7 ,
wherein the servo reading element is mounted on a magnetic head, and
the ideal waveform is a waveform determined in accordance with an orientation of the magnetic head on the magnetic tape.

11. The magnetic tape cartridge according to claim 10 ,
wherein the ideal waveform is a waveform determined in accordance with a geometrical characteristic of the servo pattern and the orientation of the magnetic head on the magnetic tape.

12. The magnetic tape cartridge according to claim 1 ,
wherein the servo format information includes information on a width of the magnetic tape and/or information on a geometrical characteristic of the servo pattern.

13. The magnetic tape cartridge according to claim 1 ,
wherein the servo format information includes width adjustment information for adjusting a width of the magnetic tape.

14. The magnetic tape cartridge according to claim 13 ,
wherein the width adjustment information includes information on tension of the magnetic tape in total length direction.

15. The magnetic tape cartridge according to claim 14 ,
wherein the information on the tension is determined in accordance with the width of the magnetic tape, a characteristic of the magnetic tape itself, a use history of the magnetic tape, a temperature given to the magnetic tape, and/or humidity given to the magnetic tape.

16. The magnetic tape cartridge according to claim 1 ,
wherein the servo format information includes information on a skew angle which is an angle at which a magnetic head on which a servo reading element that reads the servo pattern is mounted is skewed on the magnetic tape.

17. The magnetic tape cartridge according to claim 16 ,
wherein the information on the skew angle is determined in accordance with a width of the magnetic tape, a characteristic of the magnetic tape itself, a use history of the magnetic tape, a temperature given to the magnetic tape, and/or humidity given to the magnetic tape.

18. The magnetic tape cartridge according to claim 1 ,
wherein the magnetic tape is accommodated in a cartridge, and
a noncontact storage medium is provided in the cartridge as the storage medium.

19. The magnetic tape cartridge according to claim 1 ,
wherein the storage medium is the magnetic tape.

20. A magnetic tape drive comprising:
a processor,
that is configured to:
acquire the servo format information stored in the storage medium provided in the magnetic tape cartridge according to claim 1 , and
execute processing in accordance with the acquired servo format information.

21. A detection method of a servo pattern, the method comprising:
acquiring servo format information that is stored in a storage medium provided in a magnetic tape cartridge including a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and includes servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line; and
executing processing in accordance with the acquired servo format information;
wherein the first imaginary straight line is a straight line along a width direction of the magnetic tape,
the servo pattern is at least one linear magnetization region pair,
the linear magnetization region pair includes a first linear magnetization region which

Assignees

• Fujifilm Corp

Inventors

• Nakano Megumi
• Musha Atsushi
• Kaneko Tetsuya

Classifications

• G11B5/59688 Primary

  Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns · CPC title

• G11B5/02

  Recording, reproducing, or erasing methods; Read, write or erase circuits therefor · CPC title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/588 Primary

  by controlling the position of the rotating heads (by controlling the speed of the record carrier G11B15/467; by controlling speed of the heads G11B15/473; {by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G11B15/1841}) · CPC title

• G11B5/584 Primary

  for track following on tapes · CPC title