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    METHOD OF PRODUCING GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM
    1.
    发明公开
    METHOD OF PRODUCING GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM 失效
    生产用于信息记录介质的玻璃基片的方法

    公开(公告)号：EP0953548A1

    公开(公告)日：1999-11-03

    申请号：EP98935292.7

    申请日：1998-07-30

    申请人： Hoya Corporation

    发明人： HASHIMOTO, Kazuaki, Hoya Corporation ,  ZOU, Xuelu, Hoya Corporation

    IPC分类号： C03C3/087

    CPC分类号： G11B5/7315 ,  C03C3/078 ,  C03C3/087 ,  C03C3/095 ,  G11B5/6011 ,  G11B5/82 ,  G11B5/8404 ,  G11B23/0028

    摘要： Disclosed is a process for producing a glass substrate for an information recording medium by press-shaping a molten glass which gives a glass containing 0.1 to 30 mol% of TiO 2 , 1 to 45 mol% of CaO, 5 to 40 mol% of total of MgO and the above CaO, 3 to 30 mol% of total of Na 2 O and Li 2 O, 0 to 15 mol% of Al 2 O 3 and 35 to 65 mol% of SiO 2 and having properties of a liquidus temperature of 1,360°C or lower and a viscosity of at least 10 poise in a shaping-allowable temperature range, or by preparing a preform formed of a glass which contains 0.1 to 30 mol% of TiO 2 , 1 to 45 mol% of CaO, 5 to 40 mol% of total of MgO and the above CaO, 3 to 30 mol% of total of Na 2 O and Li 2 O, 0 to 15 mol% of Al 2 O 3 and 35 to 65 mol% of SiO 2 and has properties of a liquidus temperature of 1,360°C or lower and shaping the preform in the form of a disc by a re-heat pressing method.
    According to the above process, there can be mass-produced, with high productivity, high-quality glass substrates to be used for information recording media such as a magnetic disc, an optical disc, a magneto-optic disc, and the like.

    摘要翻译： 本发明提供一种信息记录介质用玻璃基板的制造方法，该方法是对熔融玻璃进行加压成形而制造玻璃基板的玻璃基板的制造方法，其中，所述熔融玻璃是含有0.1〜30摩尔％的TiO 2，1〜45摩尔％的CaO，5〜40摩尔％ MgO和上述CaO，Na 2 O和Li 2 O的合计3〜30摩尔％，Al 2 O 3 0〜15摩尔％，SiO 2 35〜65摩尔％，液相线温度为1360℃以下， 在成形允许温度范围内至少10泊，或者通过制备由含有0.1至30摩尔％的TiO 2，1至45摩尔％的CaO，5至40摩尔％的MgO和5至40摩尔％的MgO的玻璃形成的预制件 以上的CaO，3〜30摩尔％的Na 2 O和Li 2 O，0〜15摩尔％的Al 2 O 3和35〜65摩尔％的SiO 2，液相线温度为1360℃以下的性质， 通过再加热加压法制成盘。 根据上述过程，可以以高生产率批量生产高质量的玻璃基板，用于诸如磁盘，光盘，磁光盘等信息记录介质。