- Patent Title: GLASS FOR MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM SUBSTRATE, MAGNETIC RECORDING MEDIUM, GLASS SPACER FOR MAGNETIC RECORDING AND REPRODUCING APPARATUS, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS
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Application No.: US17629002Application Date: 2020-07-22
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Publication No.: US20220277768A1Publication Date: 2022-09-01
- Inventor: Koichi SATO , Kazuaki HASHIMOTO
- Applicant: HOYA CORPORATION
- Applicant Address: JP Shinjuku-ku, Tokyo
- Assignee: HOYA CORPORATION
- Current Assignee: HOYA CORPORATION
- Current Assignee Address: JP Shinjuku-ku, Tokyo
- Priority: JP2019-134578 20190722,JP2019-205993 20191114
- International Application: PCT/JP2020/028450 WO 20200722
- Main IPC: G11B5/73
- IPC: G11B5/73 ; C03C3/087
Abstract:
Provided is a glass for a magnetic recording medium substrate, which is an amorphous glass, in which an SiO2 content is in a range of 54 mol % or more and 62 mol % or less, an MgO content is in a range of 15 mol % or more and 28 mol % or less, an Li2O content is in a range of 0.2 mol % or more, and an Na2O content is in a range of 5 mol % or less.
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