公开(公告)号：US20130287938A1

公开(公告)日：2013-10-31

申请号：US13933163

申请日：2013-07-02

Applicant: HOYA CORPORATION

Inventor： Hideki ISONO

IPC: G11B5/84 ,  C03C21/00

CPC classification number: G11B5/8404 ,  C03C21/001 ,  C03C21/002

Abstract: A process for producing a glass substrate for magnetic disk through chemical strengthening operation, in which the distribution of compressive stress is uniformed at a surface layer portion. The chemical strengthening operation includes the first step of bringing the glass substrate into contact with a first treatment solution (chemical strengthening treatment solution) containing first ions with an ionic radius larger than those of ions within the glass substrate and either the second and subsequent steps of bringing the platy glass into contact with treatment solutions containing second and subsequent bivalent ions, or the second and subsequent steps of bringing the glass substrate into contact with second and subsequent chemical strengthening treatment solutions containing second and subsequent ions exhibiting an ion exchange rate with ions within the glass substrate greater than that of the first ions to thereby decelerate the ion exchange.

Abstract translation: 通过化学强化操作制造用于磁盘的玻璃基板的方法，其中压缩应力的分布在表面层部分是均匀的。 化学强化操作包括使玻璃基板与含有离子半径大于玻璃基板内的离子半径的第一离子的第一处理溶液（化学强化处理溶液）接触的第一步骤， 使板状玻璃与含有第二和随后的二价离子的处理溶液接触，或者使玻璃基板与第二次和随后的化学强化处理溶液接触的第二和随后步骤，所述第二和随后的化学强化处理溶液含有与离子的离子交换速率 玻璃基板比第一离子的玻璃基板大，从而使离子交换减速。

公开(公告)号：US20150199989A1

公开(公告)日：2015-07-16

申请号：US14667641

申请日：2015-03-24

Applicant: HOYA CORPORATION

Inventor： Shinji EDA ,  Hideki ISONO

IPC: G11B5/735 ,  C03B11/08 ,  B24B1/00 ,  C03C19/00

CPC classification number: G11B5/735 ,  B24B1/00 ,  C03B11/088 ,  C03B2215/44 ,  C03C19/00 ,  G11B5/8404 ,  Y10T428/24355

Abstract: The present invention provides a glass substrate for magnetic disk in which surface irregularity of a principal surface is suppressed and a method for efficiently manufacturing a glass substrate for magnetic disk. The method includes the steps of: forming a sheet glass material by performing press forming to molten glass, a principal surface of the sheet glass material having target flatness for the glass substrate for magnetic disk, the sheet glass material having a surface shape to be ground using a grinding abrasive grain; grinding the sheet glass material using a fixed abrasive grain; and polishing the sheet glass material using a loose abrasive grain, the sheet glass material having surface irregularity of the principal surface ground using the fixed abrasive grain.

Abstract translation: 本发明提供了一种用于抑制主面的表面不规则性的磁盘用玻璃基板和有效地制造磁盘用玻璃基板的方法。 该方法包括以下步骤：通过对熔融玻璃进行压制成形来形成玻璃板材料，对于具有用于磁盘的玻璃基板的目标平面度的玻璃板材料的主表面，具有待研磨的表面形状的玻璃板材料 使用研磨磨粒; 用固定的磨粒研磨平板玻璃材料; 并且使用松散的磨粒抛光玻璃板材料，该玻璃板材料使用固定的磨料颗粒具有主表面磨削的表面不规则性。

公开(公告)号：US20140287269A1

公开(公告)日：2014-09-25

申请号：US14299881

申请日：2014-06-09

Applicant: HOYA CORPORATION

Inventor： Shinji EDA ,  Hideki ISONO ,  Takashi MAEDA ,  Hiroshi TSUCHIYA ,  Yoshinori MARUMO

IPC: G11B5/73

CPC classification number: C03C23/009 ,  C03C19/00 ,  C03C21/008 ,  C03C23/0075 ,  C03C2204/08 ,  C09G1/02 ,  G11B5/7315 ,  G11B5/8404 ,  G11B5/8408

Abstract: Provided are a magnetic disk substrate and a method of manufacturing the same, wherein the magnetic disk substrate has very few defects present on its surface with an arithmetic mean roughness (Ra) at a level in the vicinity of 0.1 nm and thus is suitable as a substrate for a magnetic disk with high recording density. The magnetic disk glass substrate is such that the arithmetic mean roughness (Ra) of the main surface of the glass substrate measured using an atomic force microscope with a resolution of 256×256 pixels in a 2 μm×2 μm square is 0.12 nm or less and the number of defects detected to have a size of 0.1 μm to 0.6 μm in plan view and a depth of 0.5 nm to 2 nm is less than 10 per 24 cm2, wherein the defects are each detected using a shift in wavelength between incident light and reflected light upon irradiating and scanning helium neon laser light with a wavelength of 632 nm on the main surface of the glass substrate.

Abstract translation: 提供一种磁盘基板及其制造方法，其中，磁盘基板的表面上存在极少的缺陷，算术平均粗糙度（Ra）在0.1nm附近，因此适合作为 具有高记录密度的磁盘的基板。 磁盘玻璃基板使用原子力显微镜在2μm×2μm的正方形中以256×256像素的分辨率测量的玻璃基板的主面的算术平均粗糙度（Ra）为0.12nm以下 并且在平面图中检测为具有0.1μm至0.6μm的尺寸和0.5nm至2nm的深度的缺陷的数量小于每24cm 2的10个，其​​中每个使用入射光之间的波长偏移检测缺陷 并在玻璃基板的主表面上照射和扫描波长为632nm的氦氖激光的反射光。