发明公开
EP0858974A1 GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE
失效
GLASFÜR信息AUFZEICHNUNGSTRÄGERSUBSTRATUND GLASSUBSTRAT
- 专利标题: GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE
- 专利标题(中): GLASFÜR信息AUFZEICHNUNGSTRÄGERSUBSTRATUND GLASSUBSTRAT
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申请号: EP97939166.1申请日: 1997-09-04
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公开(公告)号: EP0858974A1公开(公告)日: 1998-08-19
- 发明人: ZOU, Xuelu, Hoya Corporation , TORATANI, Hisayoshi, Hoya Corporation
- 申请人: HOYA CORPORATION
- 申请人地址: 7-5, Naka-Ochiai 2-Chome Shinjuku-ku Tokyo 161 JP
- 专利权人: HOYA CORPORATION
- 当前专利权人: HOYA CORPORATION
- 当前专利权人地址: 7-5, Naka-Ochiai 2-Chome Shinjuku-ku Tokyo 161 JP
- 代理机构: Godemeyer, Thomas, Dr.
- 优先权: JP233933/96 19960904; JP233936/96 19960904; JP217622/97 19970812
- 国际公布: WO9809922 19980312
- 主分类号: C03C3/068
- IPC分类号: C03C3/068 ; C03C3/108
摘要:
Disclosed is SiO 2 -Al 2 O 3 -RO (RO = divalent metal) glass having high specific elastic modulus of 36 x 10 6 Nm/kg or more or high Young's modulus of 110 GPa or more, high transition temperature of 700°C or higher (high heat resistance). The glass exhibits excellent surface smoothness (surface roughness Ra
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