Invention Grant
- Patent Title: Magnetic recording medium, magnetic recording/reproducing device, and magnetic recording medium cartridge
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Application No.: US16651811Application Date: 2019-10-01
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Publication No.: US11527260B2Publication Date: 2022-12-13
- Inventor: Minoru Yamaga , Takanobu Iwama , Jun Takahashi
- 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: JPJP2019-150674 20190820
- International Application: PCT/JP2019/038784 WO 20191001
- International Announcement: WO2021/033332 WO 20210225
- Main IPC: G11B5/17
- IPC: G11B5/17 ; G11B5/73 ; G11B5/78

Abstract:
A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, a magnetic layer disposed on the base layer, and a back layer disposed on a side of the substrate opposite to the base layer. A surface of the back layer opposite to the substrate has a kurtosis of 2.0 or more. On a surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 10 or more and 200 or less per 1600 μm2. A surface of the magnetic layer has arithmetic average roughness Ra of 2.5 nm or less. The entire magnetic recording medium has a BET specific surface area of 3.5 m2/g or more in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.
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