Magnetic tape device, magnetic tape, and magnetic tape cartridge

Patent metadata

Field	Value
Publication number	US-11289124-B2
Application number	US-202117167589-A
Country	US
Kind code	B2
Filing date	Feb 4, 2021
Priority date	Feb 7, 2020
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

A magnetic tape device, a magnetic tape, and a magnetic tape cartridge, in which the magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.

First claim

What is claimed is:

1. A magnetic tape device comprising:
a winding reel;
a magnetic tape; and
a magnetic tape cartridge including a cartridge reel,
wherein, in the magnetic tape device,
the magnetic tape is caused to run between the winding reel and the cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more,
the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape,
the magnetic tape includes a non-magnetic support, a magnetic layer including a ferromagnetic powder on one surface side of the non-magnetic support, and a back coating layer including a non-magnetic powder on the other surface side, and
a center line average roughness Ra measured regarding a surface of the back coating layer with an atomic force microscope is in a range of 5 to 13 nm.

2. The magnetic tape device according to claim 1 ,
wherein the tension applied in the longitudinal direction of the magnetic tape during the running is changed.

3. The magnetic tape device according to claim 1 ,
wherein the magnetic tape has a tape thickness of 5.6 μm or less.

4. The magnetic tape device according to claim 1 ,
wherein the magnetic tape has a tape thickness of 5.3 μm or less.

5. The magnetic tape device according to claim 2 ,
wherein the magnetic tape has a tape thickness of 5.6 μm or less.

6. The magnetic tape device according to claim 2 ,
wherein the magnetic tape has a tape thickness of 5.3 μm or less.

7. The magnetic tape device according to claim 1 ,
wherein the magnetic tape further includes a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer.

8. A magnetic tape,
which is used in a magnetic tape device, in which the magnetic tape is caused to run between a winding reel and a cartridge reel of a magnetic tape cartridge in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, and
the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, the magnetic tape comprising:
the magnetic tape comprising: a non-magnetic support; a magnetic layer including a ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer including a non-magnetic powder on the other surface side,
wherein a center line average roughness Ra measured regarding a surface of the back coating layer with an atomic force microscope is in a range of 5 to 13 nm.

9. The magnetic tape according to claim 8 ,
wherein the tension applied in the longitudinal direction of the magnetic tape during the running is changed.

10. The magnetic tape according to claim 8 ,
wherein a tape thickness is 5.6 μm or less.

11. The magnetic tape according to claim 8 ,
wherein a tape thickness is 5.3 μm or less.

12. The magnetic tape according to claim 9 ,
wherein a tape thickness is 5.6 μm or less.

13. The magnetic tape according to claim 9 ,
wherein a tape thickness is 5.3 μm or less.

14. The magnetic tape according to claim 8 , further comprising:
a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer.

15. A magnetic tape cartridge comprising:
the magnetic tape according to claim 8 that is accommodated to be wound around a cartridge reel.

Assignees

• Fujifilm Corp

Inventors

• Kaneko Yusuke
• Murata Yuto
• Kasada Norihito

Classifications

• G11B15/32

  through the reels or cores on to which the record carrier is wound · CPC title

• G11B5/00813

  magnetic tapes · CPC title

• G11B15/43 Primary

  Control or regulation of mechanical tension of record carrier, e.g. tape tension · CPC title

• G11B5/7358

  specially adapted for achieving a specific property, e.g. average roughness [Ra] · CPC title