发明授权
- 专利标题： Glass substrate for information recording medium, manufacturing method thereof, and information recording medium
- 专利标题（中）： 用于信息记录介质的玻璃基板，其制造方法和信息记录介质
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申请号： US10194787申请日： 2002-07-12
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公开(公告)号： US06547980B1公开(公告)日： 2003-04-15
- 发明人: Junji Kurachi , Akihiro Koyama , Nobuyuki Yamamoto , Yasuhiro Saito , Kazuishi Mitani , Koichi Ataka , Yoshihiro Matsuno
- 申请人： Junji Kurachi , Akihiro Koyama , Nobuyuki Yamamoto , Yasuhiro Saito , Kazuishi Mitani , Koichi Ataka , Yoshihiro Matsuno
- 优先权： JP11-132371 19990513; JP2000-139675 20000512
- 主分类号： G11B582
- IPC分类号： G11B582
摘要：
A glass substrate for an information recording medium has an acid resistance represented by an etching rate of at most 45 nm/min. upon contact with a hydrofluoric acid having a temperature of 50° C. and a concentration of 0.1 weight %. The glass substrate has a recording surface having an average surface roughness Ra smaller than 0.3 nm.
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