- 专利标题： SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK
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申请号： US18665368申请日： 2024-05-15
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公开(公告)号： US20240296867A1公开(公告)日： 2024-09-05
- 发明人: Shinji EDA
- 申请人： HOYA CORPORATION
- 申请人地址： JP Tokyo
- 专利权人： HOYA CORPORATION
- 当前专利权人： HOYA CORPORATION
- 当前专利权人地址： JP Tokyo
- 优先权： JP 18148923 2018.08.07 JP 19009901 2019.01.24
- 主分类号： G11B5/73
- IPC分类号： G11B5/73
摘要：
A substrate for a magnetic disk has a disk shape. The substrate has a diameter D of 85 mm or more and 100 mm or less, and a thickness T of 0.3 mm or more and 0.5 mm or less. Regarding a Young's modulus E and the thickness T of the substrate, a value of E·T3 is 3 to 18 (GPa·mm3). A material of the substrate has a Q-value of 1500 or less under conditions of 3000 Hz and room temperature.
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