Invention Grant
- Patent Title: Magnetic recording medium
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Application No.: US17223741Application Date: 2021-04-06
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Publication No.: US11631430B2Publication Date: 2023-04-18
- Inventor: Minoru Yamaga , Noboru Sekiguchi , Tooru Sato , Takashi Aizawa
- Applicant: SONY GROUP CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SONY GROUP CORPORATION
- Current Assignee: SONY GROUP CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: K&L Gates LLP
- Priority: JPJP2019-086720 20190426
- Main IPC: G11B5/78
- IPC: G11B5/78 ; G11B5/70 ; G11B5/73

Abstract:
A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness tT of the magnetic recording medium is tT≤5.3 a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N≤Δw, a thickness of the non-magnetic layer is 2.0 μm or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.
Public/Granted literature
- US20210249045A1 MAGNETIC RECORDING MEDIUM Public/Granted day:2021-08-12
Information query
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