发明公开
- 专利标题: MAGNETIC RECORDING MEDIUM
-
申请号: US18123510申请日: 2023-03-20
-
公开(公告)号: US20230274764A1公开(公告)日: 2023-08-31
- 发明人: Minoru YAMAGA , Futoshi SASAKI
- 申请人: Sony Corporation
- 申请人地址: JP Tokyo
- 专利权人: Sony Corporation
- 当前专利权人: Sony Corporation
- 当前专利权人地址: JP Tokyo
- 优先权: JP 19151590 2019.08.21
- 主分类号: G11B5/706
- IPC分类号: G11B5/706 ; G11B5/73 ; G11B5/735 ; G11B5/592 ; G11B5/71 ; G11B5/714
摘要:
A magnetic recording medium is a magnetic recording medium in the form of a tape and includes a substrate, a foundation layer provided on the substrate, and a magnetic layer provided on the foundation layer and containing a magnetic powder. The foundation layer and the magnetic layer each contain a lubricant. A squareness ratio of the magnetic layer in a perpendicular direction is equal to or higher than 65%, an average thickness of the magnetic recording medium is equal to or smaller than 5.6 μm, a plurality of recessed portions each having a depth corresponding to 20% or higher of the average thickness of the magnetic layer is provided on a surface of the magnetic layer, and the number of the recessed portions per unit area of 1,600 μm2 of the surface of the magnetic layer is equal to or greater than 20 and equal to or smaller than 200, and an amount of exudation of the lubricant per unit region of 12.5 μm×9.3 μm on the surface of the magnetic layer in a vacuum is equal to or greater than 3.0 μm2 and equal to or smaller than 6.5 μm2.
公开/授权文献
- US12073861B2 Magnetic recording medium 公开/授权日:2024-08-27
信息查询
IPC分类: