MANUFACTURING METHOD OF A GLASS BLANK FOR MAGNETIC DISK AND MANUFACTURING METHOD OF A GLASS SUBSTRATE FOR MAGNETIC DISK
    1.
    发明申请
    MANUFACTURING METHOD OF A GLASS BLANK FOR MAGNETIC DISK AND MANUFACTURING METHOD OF A GLASS SUBSTRATE FOR MAGNETIC DISK 有权
    用于磁盘的玻璃棉的制造方法和用于磁盘的玻璃基板的制造方法

    公开(公告)号:US20130042649A1

    公开(公告)日:2013-02-21

    申请号:US13397180

    申请日:2012-02-15

    IPC分类号: G11B5/84 C03B11/00

    摘要: A manufacturing method of a glass blank for magnetic disk including a pair of principal surfaces, the method including: dropping process for dropping a lump of molten glass; pressing process for forming a sheet glass material by sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of the pair of dies facing together, and performing press forming to the lump; and temperature adjusting process for adjusting temperature of the lump before the pressing process such that viscosity variation of the lump is reduced with respect to positions over the entirety of the lump in the pressing process.

    摘要翻译: 一种用于包括一对主表面的磁盘用玻璃坯料的制造方法,所述方法包括:滴下熔融玻璃片的滴落工序; 压制工艺用于通过将一对模具的表面面向一体的同时从块体的下落路径的两侧夹持块体,并进行冲压成形而形成片状玻璃材料; 以及用于在压制过程之前调节块的温度的温度调节过程,使得块的粘度变化相对于在压制过程中的整体上的位置减小。

    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME
    2.
    发明申请
    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME 有权
    用于磁盘的玻璃基板及其制造方法

    公开(公告)号:US20120135153A1

    公开(公告)日:2012-05-31

    申请号:US13349495

    申请日:2012-01-12

    IPC分类号: B05D1/18

    摘要: A glass substrate for a magnetic disk of the invention is a disk-shaped glass substrate for a magnetic disk where the substrate has a main surface and end face and is subjected to chemical reinforcement treatment, and is characterized in that the penetration length in the uppermost-portion stress layer on the main surface is 49.1 μm or less, and that assuming that an angle between the main surface and compressive stress in the stress profile by a Babinet compensator method is θ, a value y of {12·t·ln(tan θ)+(49.1/t)} is the penetration length in the uppermost-portion stress layer or less.

    摘要翻译: 本发明的磁盘用玻璃基板是用于磁盘的盘状玻璃基板,其中基板具有主表面和端面并进行化学强化处理,其特征在于,最上面的穿透长度 主表面的应力层为49.1μm以下,假设通过Babinet补偿方法在应力分布中的主表面与压缩应力之间的角度为θ,则{12·t·ln (tan& t s)+(49.1 / t)}是最上部应力层的贯通长度以下。

    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF
    3.
    发明申请
    GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF 有权
    用于磁盘的玻璃基板及其制造方法

    公开(公告)号:US20140223964A1

    公开(公告)日:2014-08-14

    申请号:US14255755

    申请日:2014-04-17

    IPC分类号: C03B11/05 G11B5/735

    摘要: The present invention provides a method for efficiently manufacturing a glass substrate for magnetic disk having good accuracy of a surface irregularity and an impact resistance. The method includes the steps of: performing press forming to molten glass to prepare a sheet glass material, the sheet glass material having a roughness of the principal surface of 0.01 μm or less and target flatness of a glass substrate for magnetic disk; chemically strengthening the sheet glass material by dipping the sheet glass material in a chemically strengthening salt, thereby preparing a disk substrate; polishing the principal surfaces of the disk substrate. A thickness of the sheet glass material prepared in the press forming step is larger than a target thickness of the glass substrate for magnetic disk by a polishing quantity of the principal surface polishing step.

    摘要翻译: 本发明提供一种有效制造具有良好的表面不规则性和耐冲击性精度的磁盘用玻璃基板的方法。 该方法包括以下步骤:对熔融玻璃进行压制成型以制备玻璃板材料,该主要表面的粗糙度为0.01μm以下的玻璃材料和用于磁盘的玻璃基板的目标平面度; 通过将片状玻璃材料浸渍在化学强化盐中来化学强化片状玻璃材料,从而制备盘基片; 抛光盘基片的主表面。 通过主表面研磨工序的研磨量,在压制成形工序中制备的平板玻璃材料的厚度大于用于磁盘的玻璃基板的目标厚度。