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1. 发明授权

US09697862B2 Disk-shaped glass substrate, magnetic-disk glass substrate, method for manufacturing magnetic-disk glass substrate, and magnetic disk 有权
公开(公告)号：US09697862B2
公开(公告)日：2017-07-04
申请号：US14894859
申请日：2014-06-27
申请人： Ryuichi Kashima
发明人： Ryuichi Kashima
IPC分类号： G11B5/73 , G11B5/82 , C03C19/00 , G11B5/84
CPC分类号： G11B5/82 , B24B9/065 , B24B29/005 , C03C3/097 , C03C10/0081 , C03C19/00 , G11B5/73 , G11B5/7315 , G11B5/84 , G11B5/8404
摘要： A disk-shaped glass substrate for a magnetic-disk glass substrate includes an outer circumference having a roundness of 1.3 μm or less. A first reference circle is obtained with a least squares method from a first outline corresponding to a shape of a lap around the outer circumference. A second reference circle is obtained with a least squares method from a second outline obtained by performing low-pass filtering using a period in which the number of peaks per lap is 150 as a cut-off value on the first outline. A ratio of the second peak count value defined by the number of peaks of the second outline that project outward in a radial direction from the second reference circle to the first peak count value defined by the number of peaks of the first outline that project outward in a radial direction from the first reference circle is 0.2 or less.

2. 发明授权

US08317572B2 Method for manufacturing a glass substrate for a magnetic disc 有权
标题翻译：磁盘用玻璃基板的制造方法
公开(公告)号：US08317572B2
公开(公告)日：2012-11-27
申请号：US12682873
申请日：2008-12-22
申请人： Masaaki Ueda , Ryuichi Kashima , Seiji Sakaguchi
发明人： Masaaki Ueda , Ryuichi Kashima , Seiji Sakaguchi
IPC分类号： B24B1/00
CPC分类号： G11B5/8404 , B24B5/04 , B24B9/065
摘要： The invention aims at providing a method for manufacturing a glass substrate for a magnetic disc capable of eliminating undulations of an outer peripheral end face of a glass substrate in a short processing time, and obtaining high roundness. In a method for manufacturing a disc-like glass substrate for a magnetic disc, the method includes a forming step of pressing a rotating grindstone against an outer peripheral end face while the glass substrate is rotated, thereby forming an outer peripheral end. In the forming step, processing is performed using a first condition (S106) on which first undulations are formed and a second condition (S108) on which second undulations having a different wavelength from the first undulations are formed.
摘要翻译：本发明的目的在于提供一种制造用于磁盘的玻璃基板的方法，该方法能够在短的加工时间内消除玻璃基板的外周端面的起伏，并获得高的圆度。在制造盘状的磁盘用玻璃基板的方法中，该方法包括在玻璃基板旋转的同时将旋转砂轮压靠在外周端面的形成工序，从而形成外周端。在形成步骤中，使用其上形成有第一起伏的第一条件（S106）和形成具有与第一起伏不同的波长的第二起伏的第二条件（S108）进行处理。

3. 发明申请

US20060148386A1 Method and device for manufacturing substrate for magnetic disk, and method of manufacturing magnetic disk 有权
标题翻译：用于制造磁盘用基板的方法和装置以及制造磁盘的方法
公开(公告)号：US20060148386A1
公开(公告)日：2006-07-06
申请号：US10542803
申请日：2004-07-09
申请人： Masaaki Ueda , Ryuichi Kashima
发明人： Masaaki Ueda , Ryuichi Kashima
IPC分类号： B24B1/00
CPC分类号： G11B5/8404
摘要： A magnetic polishing method capable of easily and satisfactorily polishing the inner peripheral end face of a circular hole (1) at the center part of a disk substrate (2) even if the diameter of the circular hole is reduced. By this method, a large quantity of disk substrates with stable quality can be supplied, thermal asperity trouble and head crush can be prevented from occurring on a magnetic disk, and the density of the information recording surface of the magnetic disk can be increased. In the method for polishing the inner peripheral end face of the circular hole (1) at the center part of the disk substrate (2), a magnetic field is formed on the inner peripheral side of the circular hole (1), abrasive materials (4) including magnetic particles and abrasive grains are held by the magnetic field in the circular hole, and the magnetic field is moved to the inner peripheral end face of the circular hole (1) to move the abrasive materials (4) to the inner peripheral end face of the circular hole (1) for polishing the inner peripheral end face of the circular hole (1).
摘要翻译：即使圆孔的直径减小，也能够容易且令人满意地研磨盘基板（2）的中央部的圆形孔（1）的内周端面的磁性研磨方法。通过这种方法，可以提供大量的质量稳定的盘基片，可以防止在磁盘上发生热凹凸故障和头部挤压，并且可以提高磁盘的信息记录表面的密度。在盘状基板（2）的中央部的圆形孔（1）的内周端面的研磨方法中，在圆形孔（1）的内周侧形成磁场，研磨材料 4）包括磁性颗粒和磨粒由圆孔中的磁场保持，并且磁场移动到圆孔（1）的内周端面，以将研磨材料（4）移动到内周圆孔（1）的端面用于研磨圆孔（1）的内周端面。

4. 发明申请

US20160163344A1 DISK-SHAPED GLASS SUBSTRATE, MAGNETIC-DISK GLASS SUBSTRATE, METHOD FOR MANUFACTURING MAGNETIC-DISK GLASS SUBSTRATE, AND MAGNETIC DISK 有权
标题翻译：磁盘形玻璃基板，磁盘玻璃基板，制造磁盘玻璃基板的方法和磁盘
公开(公告)号：US20160163344A1
公开(公告)日：2016-06-09
申请号：US14894859
申请日：2014-06-27
申请人： Ryuichi KASHIMA
发明人： Ryuichi KASHIMA
IPC分类号： G11B5/82 , G11B5/84 , G11B5/73
CPC分类号： G11B5/82 , B24B9/065 , B24B29/005 , C03C3/097 , C03C10/0081 , C03C19/00 , G11B5/73 , G11B5/7315 , G11B5/84 , G11B5/8404
摘要： A disk-shaped glass substrate for a magnetic-disk glass substrate includes an outer circumference having a roundness of 1.3 μm or less. A first reference circle is obtained with a least squares method from a first outline corresponding to a shape of a lap around the outer circumference. A second reference circle is obtained with a least squares method from a second outline obtained by performing low-pass filtering using a period in which the number of peaks per lap is 150 as a cut-off value on the first outline. A ratio of the second peak count value defined by the number of peaks of the second outline that project outward in a radial direction from the second reference circle to the first peak count value defined by the number of peaks of the first outline that project outward in a radial direction from the first reference circle is 0.2 or less.
摘要翻译：用于磁盘玻璃基板的盘形玻璃基板包括圆度为1.3μm以下的外周。使用最小二乘法从与外围周围的搭接部的形状相对应的第一轮廓获得第一参考圆。使用最小二乘法从第二轮廓获得第二参考圆，该第二轮廓通过使用每圈的峰值数为150的周期进行低通滤波，作为第一轮廓上的截止值。第二峰值计数值与由第二参考圆向径向外突出的第二轮廓的峰值数量与由向外突出的第一轮廓的峰值数量所定义的第一峰值计数值所定义的第二峰值计数值的比率第一基准圆的径向方向为0.2以下。

5. 发明授权

US07175511B2 Method of manufacturing substrate for magnetic disk, apparatus for manufacturing substrate for magnetic disk, and method of manufacturing magnetic disk 有权
标题翻译：磁盘用基板的制造方法，磁盘用基板的制造装置以及制造磁盘的方法
公开(公告)号：US07175511B2
公开(公告)日：2007-02-13
申请号：US10542803
申请日：2004-07-09
申请人： Masaaki Ueda , Ryuichi Kashima
发明人： Masaaki Ueda , Ryuichi Kashima
IPC分类号： B24B1/00
CPC分类号： G11B5/8404
摘要： A magnetic polishing method capable of easily and satisfactorily polishing the inner peripheral end face of a circular hole (1) at the center part of a disk substrate (2) even if the diameter of the circular hole is reduced. By this method, a large quantity of disk substrates with stable quality can be supplied, thermal asperity trouble and head crush can be prevented from occurring on a magnetic disk, and the density of the information recording surface of the magnetic disk can be increased. In the method for polishing the inner peripheral end face of the circular hole (1) at the center part of the disk substrate (2), a magnetic field is formed on the inner peripheral side of the circular hole (1), abrasive materials (4) including magnetic particles and abrasive grains are held by the magnetic field in the circular hole, and the magnetic field is moved to the inner peripheral end face of the circular hole (1) to move the abrasive materials (4) to the inner peripheral end face of the circular hole (1) for polishing the inner peripheral end face of the circular hole (1).
摘要翻译：即使圆孔的直径减小，也能够容易且令人满意地研磨盘基板（2）的中央部的圆形孔（1）的内周端面的磁性研磨方法。通过这种方法，可以提供大量的质量稳定的盘基片，可以防止在磁盘上发生热凹凸故障和头部挤压，并且可以提高磁盘的信息记录表面的密度。在盘状基板（2）的中央部的圆形孔（1）的内周端面的研磨方法中，在圆形孔（1）的内周侧形成磁场，研磨材料 4）包括磁性颗粒和磨粒由圆孔中的磁场保持，并且磁场移动到圆孔（1）的内周端面，以将研磨材料（4）移动到内周圆孔（1）的端面用于研磨圆孔（1）的内周端面。

6. 发明申请

US20100285726A1 METHOD FOR MANUFACTURING A GLASS SUBSTRATE FOR A MAGNETIC DISC 有权
标题翻译：用于制造用于磁盘的玻璃基板的方法
公开(公告)号：US20100285726A1
公开(公告)日：2010-11-11
申请号：US12682873
申请日：2008-12-22
申请人： Masaaki Ueda , Ryuichi Kashima , Seiji Sakaguchi
发明人： Masaaki Ueda , Ryuichi Kashima , Seiji Sakaguchi
IPC分类号： B24B9/08 , B24B1/00
CPC分类号： G11B5/8404 , B24B5/04 , B24B9/065
摘要： The invention aims at providing a method for manufacturing a glass substrate for a magnetic disc capable of eliminating undulations of an outer peripheral end face of a glass substrate in a short processing time, and obtaining high roundness. In a method for manufacturing a disc-like glass substrate for a magnetic disc, the method includes a forming step of pressing a rotating grindstone against an outer peripheral end face while the glass substrate is rotated, thereby forming an outer peripheral end. In the forming step, processing is performed using a first condition (S106) on which first undulations are formed and a second condition (S108) on which second undulations having a different wavelength from the first undulations are formed.
摘要翻译：本发明的目的在于提供一种制造用于磁盘的玻璃基板的方法，该方法能够在短的加工时间内消除玻璃基板的外周端面的起伏，并获得高的圆度。在制造盘状的磁盘用玻璃基板的方法中，该方法包括在玻璃基板旋转的同时将旋转砂轮压靠在外周端面的形成工序，从而形成外周端。在形成步骤中，使用其上形成有第一起伏的第一条件（S106）和形成具有与第一起伏不同的波长的第二起伏的第二条件（S108）进行处理。

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