公开(公告)号：US20190074032A1

公开(公告)日：2019-03-07

申请号：US16115962

申请日：2018-08-29

Applicant: FUJIFILM Corporation

Inventor： Masahiko MORI ,  Yoshihiro SAWAYASHIKI

IPC: G11B5/714

Abstract: The magnetic recording medium includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder, a binding agent, and a non-magnetic powder on the non-magnetic layer, in which a skewness Rsk obtained using an atomic force microscope in a measurement region of a surface of the magnetic layer having a size of 5 μm×5 μm is greater than 0, a maximum peak height Rmax is equal to or smaller than 30.0 nm, and the number of projections having a height equal to or greater than 10 nm is equal to or greater than 10, and a magnetic recording and reproducing device including: this magnetic recording medium; and a magnetic head.

公开(公告)号：US20230178107A1

公开(公告)日：2023-06-08

申请号：US18161509

申请日：2023-01-30

Applicant: FUJIFILM Corporation

Inventor： Shinji TSUJIMOTO ,  Shunichi HOSHINO ,  Yoshihiro SAWAYASHIKI

IPC: G11B5/735 ,  G11B5/78

CPC classification number: G11B5/7353 ,  G11B5/78

Abstract: Provided are a magnetic tape including a non-magnetic support and a magnetic layer including a ferromagnetic powder, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape. An amount of a fluid lubricant collected by wiping a surface of the magnetic layer by a nonwoven fabric is in a range of 5 to 400 ng/m2 as a value per unit area of the surface of the magnetic layer.

公开(公告)号：US20200302962A1

公开(公告)日：2020-09-24

申请号：US16825425

申请日：2020-03-20

Applicant: FUJIFILM Corporation

Inventor： Yoshihiro SAWAYASHIKI ,  Norihito KASADA

IPC: G11B5/706 ,  G11B5/735 ,  G11B5/714 ,  G11B5/712 ,  G11B5/008

Abstract: The magnetic tape includes: a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ε-iron oxide powder, and the number of protrusions having a height of 50 nm or more and less than 75 nm on a surface of the back coating layer is 700 pieces/6400 μm2 or less.