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1. 发明申请

US20120135153A1 GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD OF THE SAME 有权
标题翻译：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
申请人： Kinobu OSAKABE , Hideki ISONO , Katsuyuki IWATA , Shinji EDA , Kenichiro TERADA
发明人： Kinobu OSAKABE , Hideki ISONO , Katsuyuki IWATA , Shinji EDA , Kenichiro TERADA
IPC分类号： B05D1/18
CPC分类号： G11B5/7315 , C03C21/002 , G11B5/8404
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＆amp; t s）+（49.1 / t）}是最上部应力层的贯通长度以下。

2. 发明申请

US20110159320A1 GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF 有权
标题翻译：用于磁盘的玻璃基板及其制造方法
公开(公告)号：US20110159320A1
公开(公告)日：2011-06-30
申请号：US12979171
申请日：2010-12-27
申请人： Shinji EDA , Hideki Isono
发明人： Shinji EDA , Hideki Isono
IPC分类号： G11B5/82 , G11B5/84 , G11B5/73 , B24B1/00
CPC分类号： G11B5/735 , B24B1/00 , C03B11/088 , C03B2215/44 , C03C19/00 , G11B5/8404 , Y10T428/24355
摘要： 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.
摘要翻译：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。

3. 发明申请

US20120144865A1 MANUFACTURING METHOD FOR A GLASS SUBSTRATE FOR MAGNETIC DISK 有权
标题翻译：用于磁盘的玻璃基板的制造方法
公开(公告)号：US20120144865A1
公开(公告)日：2012-06-14
申请号：US13313593
申请日：2011-12-07
申请人： Shinji EDA , Hideki Isono , Akira Murakami
发明人： Shinji EDA , Hideki Isono , Akira Murakami
IPC分类号： C03B11/12 , C03B7/11 , C03B11/05
CPC分类号： C03B7/11 , C03B11/05 , C03B11/088 , C03B11/122 , C03B2215/70 , C03C19/00 , C03C21/002
摘要： The present invention provides a manufacturing method of a sheet glass material excellent in flatness. A manufacturing method of glass substrate for magnetic disk including a pair of principal surfaces, the method comprising the steps of: dropping process for dropping a lump of molten glass; pressing process for forming a sheet glass material by performing press forming to the lump while sandwiching the lump from both sides of the dropping path of the lump with facing surfaces of a pair of dies, the pair of dies being set to substantially the same temperature; and processing process for processing the sheet glass material, while the lump drops down while revolving around its dropping axis.
摘要翻译：本发明提供了平坦度优异的平板玻璃材料的制造方法。一种包括一对主表面的用于磁盘的玻璃基板的制造方法，所述方法包括以下步骤：落下熔融玻璃块的滴落处理; 通过在一块模具的相对表面上从块体的下落路径的两侧夹持块状物的同时进行冲压成形而形成片状玻璃材料的压制工序，一对模具被设定为大致相同的温度; 以及用于处理片状玻璃材料的处理过程，同时在其下落轴线周围旋转时块状物下落。

4. 发明申请

US20140223964A1 GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURING METHOD THEREOF 有权
标题翻译：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
申请人： Shinji EDA , Hideki ISONO
发明人： Shinji EDA , Hideki ISONO
IPC分类号： C03B11/05 , G11B5/735
CPC分类号： C03B11/05 , B24B41/06 , C03B11/005 , C03B11/08 , C03B11/088 , C03B11/125 , G11B5/7315 , G11B5/735 , G11B5/8404
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。

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