Invention Grant
- Patent Title: Glass substrate and thermal-assisted magnetic recording disk
- Patent Title (中): 玻璃基板和热辅助磁记录盘
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Application No.: US12367632Application Date: 2009-02-09
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Publication No.: US07972715B2Publication Date: 2011-07-05
- Inventor: Norihisa Shibayama , Yasuhiro Naka , Nobuaki Orita
- Applicant: Norihisa Shibayama , Yasuhiro Naka , Nobuaki Orita
- Applicant Address: JP Tokyo
- Assignee: The Furukawa Electric Co., Ltd.
- Current Assignee: The Furukawa Electric Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2008-075909 20080324
- Main IPC: G11B5/70
- IPC: G11B5/70 ; G11B5/82 ; G21G4/00
Abstract:
A plurality of recording magnetization portions is arranged in a concentric manner around a center of a glass substrate. A plurality of non-magnetization portion having a thermal conductivity lower than that of the recording magnetization portions is formed each between adjacent recording magnetization portions along a circumferential direction on a main surface of the glass substrate. A mean squared roughness of a surface of an area where each of the non-magnetization portions is formed is equal to or smaller than 1 nanometer.
Public/Granted literature
- US20090239101A1 GLASS SUBSTRATE AND THERMAL-ASSISTED MAGNETIC RECORDING DISK Public/Granted day:2009-09-24
Information query
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