发明名称 |
Glass substrate for an information recording medium, method for manufacturing a glass substrate for an information recording medium, and an information recording medium |
摘要 |
Provided are a glass substrate for an information recording medium, which has both high strength and high flatness and can be manufactured at low cost, a method for manufacturing such glass substrate and an information recording medium using such glass substrate. The glass substrate for the information recording medium satisfies inequalities of 0.1≦̸(W1−W3)/W2≦̸5, where, W1 is an ion concentration at the center portion in the thickness direction of the glass substrate in a chemically reinforced region at the outer circumference end surface and the inner circumference end surface of the glass substrate and is the maximum value of K+ ion concentration, W2 is a Na+ ion concentration at a position where the K+ ion concentration is maximum, and W3 is a K+ ion concentration in a glass substrate region not chemically reinforced.
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申请公布号 |
US7882709(B2) |
申请公布日期 |
2011.02.08 |
申请号 |
US20070312685 |
申请日期 |
2007.11.05 |
申请人 |
KONICA MINOLTA OPTO, INC. |
发明人 |
KAWAI HIDEKI;SASAKI KENICHI;SAWADA HIROAKI |
分类号 |
G11B5/73;C03C15/00 |
主分类号 |
G11B5/73 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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