Magnetic tape recording device having dual reading transducers

Patent metadata

Field	Value
Publication number	US-11017805-B2
Application number	US-202016795800-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 26, 2019
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A magnetic tape reading apparatus comprises an acquisition unit that acquires information on linearity of a servo pattern to be recorded on a servo band of a magnetic tape, a reading element unit in which at least two reading elements each of which reads data from a specific track region included in the magnetic tape are disposed, a servo reading element that reads the servo pattern, a control unit that performs control of positioning the reading element unit, a derivation unit that derives a deviation amount, and an extraction unit that extracts data recorded on the reading target track by performing a waveform equalization process on each reading result for the reading elements in accordance with the deviation amount.

First claim

What is claimed is:

1. A magnetic tape reading apparatus, comprising:
a processor;
a reading element unit; and
a servo reading element, wherein:
the processor acquires, from a magnetic tape cartridge, information related to linearity of a servo pattern to be recorded on a servo band of a magnetic tape included in the magnetic tape cartridge,
the reading element unit includes at least two reading elements that are adjacent to each other,
each of the at least two reading elements reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,
the servo reading element reads the servo pattern, and
the processor:
performs control of positioning the reading element unit by using a read signal of the servo pattern read by the servo reading element and the acquired information related to linearity,
derives a deviation amount between positions of the magnetic tape and the reading element unit by using the read signal of the servo pattern in a state of performing the control, and
extracts data recorded on the reading target track from a reading result by performing a waveform equalization process on each reading result of the at least two reading elements in accordance with the derived deviation amount.

2. A magnetic tape reading apparatus, comprising:
a processor;
a reading element unit; and
a servo reading element, wherein:
the processor acquires, from a magnetic tape cartridge, information related to linearity of a servo pattern to be recorded on a servo band of a magnetic tape included in the magnetic tape cartridge,
the reading element unit includes at least two reading elements that are adjacent to each other,
each of the at least two reading elements reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,
the servo reading element reads the servo pattern, and
the processor:
performs control of positioning the reading element unit by using a read signal of the servo pattern read by the servo reading element,
derives a deviation amount between positions of the magnetic tape and the reading element unit by using the read signal of the servo pattern and the acquired information related to linearity, in a state of performing the control, and
extracts data recorded on the reading target track from a reading result by performing a waveform equalization process on each reading result of the at least two reading elements in accordance with the derived deviation amount.

3. The magnetic tape reading apparatus according to claim 1 , wherein the processor derives the deviation amount by using the information related to linearity in addition to the read signal of the servo pattern.

4. The magnetic tape reading apparatus according to claim 2 , wherein the processor performs the control of positioning the reading element unit by using the information related to the linearity in addition to the read signal of the servo pattern.

5. The magnetic tape reading apparatus according to claim 1 ,
wherein the specific track region is a region including the reading target track and an adjacent track that is adjacent to the reading target track, and
in a case in which a positional relationship with the magnetic tape is changed, at least one reading element of the at least two reading elements extends over both the reading target track and the adjacent track, and at least one other reading element of the at least two reading elements falls within the reading target track.

6. The magnetic tape reading apparatus according to claim 1 , wherein respective parts of the at least two reading elements overlap with each other in a running direction of the magnetic tape.

7. The magnetic tape reading apparatus according to claim 6 ,
wherein the specific track region is a region including the reading target track and an adjacent track that is adjacent to the reading target track, and
in a case in which a positional relationship with the magnetic tape is changed, the at least two reading elements extend over both the reading target track and the adjacent track.

8. The magnetic tape reading apparatus according to claim 1 , wherein a tap coefficient used in the waveform equalization process is determined in accordance with the deviation amount.

9. The magnetic tape reading apparatus according to claim 8 , wherein the processor derives the tap coefficient based on the deviation amount by using a table in which the tap coefficient and the deviation amount are associated with each other.

10. The magnetic tape reading apparatus according to claim 8 , wherein for each of the at least two reading elements, a ratio between an overlapping region with the reading target track and an overlapping region with an adjacent track that is adjacent to the reading target track is specified based on the deviation amount, and the tap coefficient is determined in accordance with the specified ratio.

11. The magnetic tape reading apparatus according to claim 1 , wherein the information related to linearity of the servo pattern is information related to linearity of a servo recording element of a servo recording head that records the servo pattern on the magnetic tape.

12. The magnetic tape reading apparatus according to claim 1 , wherein the information related to the linearity of the servo pattern is recorded in a format of a table or arithmetic expression.

13. A magnetic tape reading method using a reading element unit in which at least two reading elements are adjacent to each other, the method comprising:
acquiring, by processor, information, recorded on a recording medium included in a magnetic tape cartridge, related to linearity of a servo pattern to be recorded on a servo band of a magnetic tape included in the magnetic tape cartridge;
reading, by a servo reading element, the servo pattern;
positioning, by the processor, the reading element unit by using a read signal of the servo pattern and the information related to the linearity;
deriving, by the processor, a deviation amount between positions of the magnetic tape and the reading element unit by using the read signal of the servo pattern, in a state of performing control of the positioning;
reading, by each of the at least two reading elements, data from a specific track region including a reading target track in a track region included in the magnetic tape by a linear scanning method; and
extracting, by the processor, data recorded on the reading target track from a reading result by performing a waveform equalization process on each reading result of the at least two reading elements in accordance with the derived deviation amount.

14. A magnetic tape reading method using a reading element unit in which at least two reading elements are adjacent to each other, the method comprising:
acquiring, by a processor, information, recorded on a recording medium included in a magnetic tape cartridge, related to linearity of a servo pattern to be recorded on a servo band of a magnetic tape included in the magnetic tape cartridge;
reading, by a servo reading element, the servo pattern;
positioning, by the processor, the reading element unit by using a read signal of the servo pattern;
deriving, by the processor, a deviation amount between positions of the magnetic tape and the reading element unit by using the read signal of the servo pattern and the information related to the linearity, in a state of performing control of the positioning;
reading, by each of the at least two reading elements, data from a specific track region incl

Assignees

• Fujifilm Corp

Inventors

• Kaneko Tetsuya
• Musha Atsushi

Classifications

• G11B5/59638

  Servo formatting apparatuses, e.g. servo-writers · CPC title

• G11B5/5508 Primary

  Control circuits therefor (G11B5/5513 takes precedence) · CPC title

• G11B5/584

  for track following on tapes · CPC title

• G11B5/00826

  comprising a plurality of single poles or gaps or groups thereof operative at the same time · 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