US 12,334,125 B2
Magnetic tape having characterized magnetic layer, 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 May 31, 2024, as Appl. No. 18/680,257.
Application 18/680,257 is a continuation of application No. PCT/JP2022/043998, filed on Nov. 29, 2022.
Claims priority of application No. 2021-195837 (JP), filed on Dec. 2, 2021.
Prior Publication US 2024/0321309 A1, Sep. 26, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/706 (2006.01); G11B 5/008 (2006.01); G11B 5/588 (2006.01); G11B 5/65 (2006.01); G11B 5/708 (2006.01); G11B 5/714 (2006.01); G11B 5/735 (2006.01); G11B 5/78 (2006.01)
CPC G11B 5/70678 (2013.01) [G11B 5/7085 (2013.01); G11B 5/714 (2013.01); G11B 5/7356 (2019.05); G11B 5/78 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer including a ferromagnetic powder,
wherein the non-magnetic support is a polyethylene naphthalate support having a Young's modulus in a width direction of 10000 MPa or more, 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, which is measured at a tilt angle of 45° of an AlFeSil square bar, is 20 μm or more and 50 μm or less,
standard deviation of AlFeSil abrasion values of the surface of the magnetic layer, which are respectively measured at tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil square bar, is 30 μm or less, and
the tilt angle of the AlFeSil square bar is an angle formed by a longitudinal direction of the AlFeSil square bar and a width direction of the magnetic tape.