发明授权
- 专利标题： Glass for use as substrate for information recording medium, substrate for information recording medium and information recording medium, and their production methods
- 专利标题（中）： 用作信息记录介质的基板的玻璃，信息记录介质的基板和信息记录介质及其制造方法
-
申请号： US13605006申请日： 2012-09-06
-
公开(公告)号： US08785011B2公开(公告)日： 2014-07-22
- 发明人: Kazuo Tachiwana , Yoichi Hachitani , Xuelu Zou , Mikio Ikenishi , Kinobu Osakabe
- 申请人： Kazuo Tachiwana , Yoichi Hachitani , Xuelu Zou , Mikio Ikenishi , Kinobu Osakabe
- 申请人地址： JP Tokyo
- 专利权人： Hoya Corporation
- 当前专利权人： Hoya Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Sughrue Mion, PLLC
- 优先权： JP2006-159223 20060608
- 主分类号： G11B5/84
- IPC分类号： G11B5/84 ; G11B5/667 ; C03B37/00 ; C03C3/095 ; C03C3/083
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 SiO2 and Al2O3, where SiO2 content is equal to or greater than 50 percent and Al2O3 content is equal to or greater than 3 percent; a total of equal to or greater than 10 percent of Li2O, Na2O and K2O; 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 ZrO2, HfO2, Nb2O5, Ta2O5, La2O3 Y2O3 and TiO2; with the molar ratio of the total content of Li2O, Na2O and K2O to the total content of SiO2, Al2O3, ZrO2, HfO2, Nb2O5, Ta2O5, La2O3, Y2O3 and TiO2 ((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) 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.
公开/授权文献
信息查询
IPC分类:
