Invention Grant
US08168313B2 Glass for information recording medium substrate, glass substrate for information recording medium and magnetic disk
有权
用于信息记录介质基板的玻璃，用于信息记录介质的玻璃基板和磁盘
- Patent Title: Glass for information recording medium substrate, glass substrate for information recording medium and magnetic disk
- Patent Title (中): 用于信息记录介质基板的玻璃，用于信息记录介质的玻璃基板和磁盘
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Application No.: US12724570Application Date: 2010-03-16
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Publication No.: US08168313B2Publication Date: 2012-05-01
- Inventor: Jun Endo , Tatsuo Nagashima , Tetsuya Nakashima , Manuel Diaz Reyes
- Applicant: Jun Endo , Tatsuo Nagashima , Tetsuya Nakashima , Manuel Diaz Reyes
- Applicant Address: JP Tokyo
- Assignee: Asahi Glass Company, Limited
- Current Assignee: Asahi Glass Company, Limited
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2009-090104 20090402; JP2010-030190 20100215
- Main IPC: G11B5/73
- IPC: G11B5/73 ; C03C3/085 ; C03C3/087
Abstract:
A glass for an information recording medium substrate, which comprises, as represented by mol % based on the following oxides, from 61 to 72% of SiO2, from 3 to 11% of Al2O3, from 0 to 14.3% of Li2O, from 0 to 22% of Na2O, from 0 to 22% of K2O, from 4 to 13% of MgO, from 0 to 6% of TiO2 and from 0 to 5% of ZrO2, provided that the total content of Li2O, Na2O and K2O (R2O) is from 10 to 22%, and (a) the ratio of the content of Li2O to R2O (Li2O/R2O) is at most 0.52, (b) the ratio of the content of Na2O to R2O (Na2O/R2O) is at least 0.35, or (c) the ratio of the content of K2O to R2O (K2O/R2O) is at least 0.45.
Public/Granted literature
Information query
IPC分类:
