发明名称 |
Method of manufacturing glass substrate for use as information recording medium |
摘要 |
A glass substrate for use as an information recording medium has an average surface roughness (Ra) in the range of 0.3 nm<=Ra<3.0 nm and includes surface irregularities shaped and distributed isotropically and arranged substantially in succession. The surface irregularities include 5 to 50,000 convexities having a height of at least 3 nm and no convexities having a height of at least 15 nm within an area of 50 mumx50 mum. A porous region produced by an acid treatment process in the glass substrate would be completely removed if excessively etched by an alkaline solution. However, the etching process using the alkaline solution can be stopped at a stage where the pores in the porous region are enlarged by controlling conditions for the acid and alkali treatment processes.
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申请公布号 |
US6550278(B2) |
申请公布日期 |
2003.04.22 |
申请号 |
US20020213554 |
申请日期 |
2002.08.06 |
申请人 |
NIPPON SHEET GLASS CO., LTD. |
发明人 |
MITANI KAZUISHI;SAITO YASUHIRO;ATAKA KOICHI;KOYAMA AKIHIRO;KURACHI JUNJI;YAMAMOTO NOBUYUKI;MATSUNO YOSHIHIRO |
分类号 |
C03C3/083;C03C3/085;C03C3/087;C03C15/00;C03C19/00;C03C21/00;G11B5/73;G11B5/84;(IPC1-7):C03C21/00 |
主分类号 |
C03C3/083 |
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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