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1.发明公开公开(公告)号：US20240233764A9
公开(公告)日：2024-07-11
申请号：US18547572
申请日：2022-02-24
申请人： HOYA CORPORATION
发明人： Shuhei AZUMA , Toshio TAKIZAWA
CPC分类号： G11B5/73921 , G11B5/82 , G11B5/84
摘要： A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 μm or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.
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公开(公告)号：US20190228801A1
公开(公告)日：2019-07-25
申请号：US16368046
申请日：2019-03-28
发明人： Masanobu ITAYA , Kinobu OSAKABE , Toshio TAKIZAWA
摘要： A hard disk drive includes a magnetic-disk substrate in which an average value of squares of inclinations is 0.0025 or less and a frequency at which squares of inclinations are 0.004 or more is 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm.
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公开(公告)号：US20150109703A1
公开(公告)日：2015-04-23
申请号：US14551675
申请日：2014-11-24
IPC分类号： G11B5/82
CPC分类号： G11B5/7315 , G11B5/82
摘要： A magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate. The representative structure of the magnetic disk substrate is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.
摘要翻译： 即使磁盘高速旋转也适用于通过加载/卸载方法启动和停止的硬盘以及使用这种基板的磁盘，高度可靠地防止发生碰撞故障的磁盘基板。 磁盘基板的代表性结构是具有大致平坦的主表面11，端面12，形成在主表面11和端面12之间的倒角面13和偏移部分的圆盘形玻璃基板10， 在主表面11的周边处，相对于主表面11的外周面的平坦表面升高或降低，其特征在于，偏移部分的大小在玻璃的整个圆周上大致均匀 基板10。
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4.发明申请公开(公告)号：US20200208015A1
公开(公告)日：2020-07-02
申请号：US16641185
申请日：2018-10-31
申请人： HOYA CORPORATION
发明人： Toshio TAKIZAWA
摘要： Letting a particle diameter be Dx (μm) when a cumulative particle volume cumulated from the small particle diameter side reaches x(%) of the total particle volume in a particle size distribution obtained regarding cerium oxide included in a polishing liquid using a laser diffraction/scattering method, D5 is 1 μm or less, and a difference between D95 and D5 is 3 μm or more.
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公开(公告)号：US20240327280A1
公开(公告)日：2024-10-03
申请号：US18574152
申请日：2022-07-05
申请人： HOYA CORPORATION
发明人： Shuhei AZUMA , Toshio TAKIZAWA
CPC分类号： C03C23/0025 , C03C15/02 , C03C23/007 , C03C2203/52
摘要： A method for manufacturing a glass substrate includes: flattening a to-be-scribed region extending along a predetermined to-be-scribed line on a surface of a glass blank by irradiating the surface of the glass blank with a first laser beam along the to-be-scribed line; and forming a scribe line along the to-be-scribed line by irradiating the flattened to-be-scribed region with a second laser beam.
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6.发明申请MAGNETIC DISK SUBSTRATE WITH OFFSET PORTION ON A MAIN SURFACE WITHIN A RANGE OF 92.0 to 97.0% IN A RADIAL DIRECTION FROM A CENTER, MAGNETIC DISK WITH SUBSTRATE AND MAGNETIC DISK DEVICE 审中-公开磁性磁体基板，其中一个主表面上的主表面在92.0至97.0％范围内的中心位置，带有基板和磁性磁盘的磁性磁盘公开(公告)号：US20150340054A1
公开(公告)日：2015-11-26
申请号：US14818796
申请日：2015-08-05
CPC分类号： G11B5/7315 , G11B5/82
摘要： A magnetic disk substrate having a flat main surface, an end face, and a chamfered face formed between the main surface and the end face. The substrate has an offset portion, present on the main surface within a range of 92.0 to 97.0% in a radial direction from a center of the substrate. A distance from the center of the substrate to the end face of the substrate in a radial direction is 100%, the offset portion being raised or lowered with respect to a virtual straight line connecting two points on the main surface, set at positions of 92.0% and 97.0%. A maximum distance from the virtual straight line to the offset portion in a direction perpendicular to the virtual straight line is a “maximum offset value.”
摘要翻译： 一种磁盘基板，其具有平坦的主表面，端面和形成在主表面和端面之间的倒角面。 该基板具有偏离部分，该主体表面在距离基板中心的径向方向上在92.0至97.0％的范围内。 从基板的中心到基板的端面的径向方向的距离为100％，偏移部相对于连接主面上的两点的虚拟直线上升或下降，设定在92.0的位置 ％和97.0％。 在与虚拟直线垂直的方向上从虚拟直线到偏移部分的最大距离为“最大偏移值”。
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公开(公告)号：US20240174556A1
公开(公告)日：2024-05-30
申请号：US18553300
申请日：2022-03-31
申请人： HOYA CORPORATION
发明人： Shuhei AZUMA , Toshio TAKIZAWA
IPC分类号： C03C15/02
CPC分类号： C03C15/02 , C03C2203/50
摘要： A method for manufacturing an annular glass substrate includes: forming, on a glass blank, a separation line that includes a plurality of defects along a predetermined circle by irradiating a surface of the glass blank with a laser beam along the circle; and separating a portion outside the separation line of the glass blank on which the separation line was formed from a portion inside the separation line by heating the portion outside the separation line at a higher temperature than the portion inside the separation line. The separation line includes: a first region in which the defects are periodically formed and an interval between a pair of adjacent defects is a first interval; and a second region in which an interval between a pair of adjacent defects is shorter than the first interval.
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8.发明公开公开(公告)号：US20240135970A1
公开(公告)日：2024-04-25
申请号：US18547572
申请日：2022-02-24
申请人： HOYA CORPORATION
发明人： Shuhei AZUMA , Toshio TAKIZAWA
CPC分类号： G11B5/73921 , G11B5/82 , G11B5/84
摘要： A magnetic-disk substrate according to an embodiment includes two main surfaces and an outer circumferential edge surface. In the magnetic-disk substrate, the outer circumferential edge surface includes two chamfered surfaces that are respectively connected to the main surfaces, and a side wall surface that is curved and extends to protrude outward between the two chamfered surfaces. The side wall surface has a radius of curvature of 1100 μm or more on a cross-section of the magnetic-disk substrate extending along a plate thickness direction of the magnetic-disk substrate.
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公开(公告)号：US20170270956A1
公开(公告)日：2017-09-21
申请号：US15611243
申请日：2017-06-01
CPC分类号： G11B5/7315 , G11B5/82
摘要： A magnetic disk substrate having a flat main surface, an end face, and a chamfered face formed between the main surface and the end face. The substrate has an offset portion, present on the main surface within a range of 92.0 to 97.0% in a radial direction from a center of the substrate. A distance from the center of the substrate to the end face of the substrate in a radial direction is 100%, the offset portion being raised or lowered with respect to a virtual straight line connecting two points on the main surface, set at positions of 92.0% and 97.0%. A maximum distance from the virtual straight line to the offset portion in a direction perpendicular to the virtual straight line is a “maximum offset value.”
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公开(公告)号：US20230287244A1
公开(公告)日：2023-09-14
申请号：US18321385
申请日：2023-05-22
申请人： HOYA CORPORATION
发明人： Toshio TAKIZAWA
CPC分类号： C09G1/02 , G11B5/73921 , B24B7/241 , B24B7/245 , C03C17/002 , G11B5/8404
摘要： Letting a particle diameter be Dx (μm) when a cumulative particle volume cumulated from the small particle diameter side reaches x (%) of the total particle volume in a particle size distribution obtained regarding cerium oxide included in a polishing liquid using a laser diffraction/scattering method, D5 is 1 μm or less, D100 is 3 μm or more, D50 is 0.8 to 2.4 μm, and Dpeak−D5 is less than D95−Dpeak.
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