发明公开
- 专利标题： GLASS FOR USE AS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, SUBSTRATE FOR INFORMATION RECORDING MEDIUM, INFORMATION RECORDING MEDIUM, AND THEIR PRODUCTION METHODS
- 专利标题（中）： 玻璃用作衬底用于信息记录媒体的基片信息记录介质; 记录媒体与信息处理用于生产
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申请号： EP07744930.4申请日： 2007-06-08
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公开(公告)号： EP2036867A1公开(公告)日： 2009-03-18
- 发明人: TACHIWANA, Kazuo , HACHITANI, Yoichi , ZOU, Xuelu , IKENISHI, Mikio , OSAKABE, Kinobu
- 申请人： Hoya Corporation
- 申请人地址： 7-5, Naka-Ochiai 2-chome Shinjuku-ku Tokyo 161-8525 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 161-8525 JP
- 代理机构： Albrecht, Thomas
- 优先权： JP2006159223 20060608
- 国际公布： WO2007142324 20071213
- 主分类号： C03C3/087
- IPC分类号： C03C3/087 ; C03C3/085 ; C03C3/095 ; C03C3/097 ; C03C21/00 ; G11B5/73 ; G11B5/82
摘要：
According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO 2 and Al 2 O 3 , where SiO 2 content is equal to or greater than 50 percent and Al 2 O 3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li 2 O, Na 2 O and K 2 O; a total of 1 to 6 percent of CaO and MgO, where CaO content is greater than MgO content; a total of greater than 0 percent but equal to or lower than 4 percent of ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 , La 2 O 3 Y 2 O 3 and TiO 2 ; with the molar ratio of the total content of Li 2 O, Na 2 O and K 2 O to the total content of SiO 2 , Al 2 O 3 , ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 , La 2 O 3 ,Y 2 O 3 and TiO 2 ((Li 2 O + Na 2 O + K 2 O)/(SiO 2 + Al 2 O 3 + ZrO 2 + HfO 2 + Nb 2 O 5 + Ta 2 O 5 + La 2 O 3 + Y 2 O 3 + TiO 2 )) being equal to or less than 0.28. Further provided are the substrate for information recording medium, information recording medium and their manufacturing methods according to the present invention.
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