US 11,869,558 B2
Magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device
Norihito Kasada, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Sep. 28, 2022, as Appl. No. 17/955,035.
Claims priority of application No. 2021-158788 (JP), filed on Sep. 29, 2021; and application No. 2022-145715 (JP), filed on Sep. 14, 2022.
Prior Publication US 2023/0103562 A1, Apr. 6, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/735 (2006.01); G11B 5/78 (2006.01); G11B 5/708 (2006.01)
CPC G11B 5/7356 (2019.05) [G11B 5/7085 (2013.01); G11B 5/78 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer containing a ferromagnetic powder,
wherein a tape thickness of the magnetic tape is 5.2 μm or less, and
in an environment with a temperature of 23° C. and a relative humidity of 50%,
an AlFeSil abrasion value45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm,
a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and
the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.