METHOD OF PRODUCING GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM
    3.
    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

    IPC分类号: C03C3/087

    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。

    GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE
    4.
    发明公开
    GLASS FOR INFORMATION RECORDING MEDIUM SUBSTRATE AND GLASS SUBSTRATE 失效
    GLASFÜR信息AUFZEICHNUNGSTRÄGERSUBSTRATUND GLASSUBSTRAT

    公开(公告)号:EP0858974A1

    公开(公告)日:1998-08-19

    申请号:EP97939166.1

    申请日:1997-09-04

    申请人: HOYA CORPORATION

    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

    摘要翻译: 披露了高比弹性模量为36×10 6 Nm / kg以上或更高的杨氏模量为110GPa以上,高转变温度为700℃以上的SiO2-Al2O3-RO(RO =二价金属)玻璃 (高耐热性)。 玻璃表现出优异的表面光滑度(表面粗糙度Ra <9安格姆)和高强度,可以为玻璃基材提供高强度。 由于玻璃基板由具有优异的耐热性和平坦度的玻璃组成,所以可以对基板进行热处理以提高磁性层特性,而不会使基板分解,并实现较小的磁头飞行高度,即较高的记录密度。 具有高比弹性模量和高强度的玻璃使得能够实现更薄的磁盘并防止磁盘的击穿。