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公开(公告)号：US20150213826A1
公开(公告)日：2015-07-30
申请号：US14424261
申请日：2013-06-28
Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
Inventor： Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
CPC classification number: G11B5/7315 , G11B5/82
Abstract: A magnetic-disk glass substrate of the present invention has an average value of squares of inclinations of 0.0025 or less and a frequency at which squares of inclinations are 0.004 or more of 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm.
Abstract translation: 在本发明的磁盘玻璃基板中，在主体上倾斜的样本的情况下，倾斜平方的平均值为0.0025以下，倾斜方格为0.004以上的频率为15％以下 以10nm的间隔获得表面。
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Patent Agency Ranking
公开(公告)号：US11081134B2
公开(公告)日：2021-08-03
申请号：US16368046
申请日：2019-03-28
Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
Inventor： Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
Abstract: 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：US09728217B2
公开(公告)日：2017-08-08
申请号：US15029117
申请日：2013-10-31
Applicant: HOYA GLASS DISK VIETNAM II LTD. , HOYA CORPORATION
Inventor： Masayoshi Yoshida , Masahiro Katagiri
CPC classification number: G11B5/722 , G11B5/7315 , G11B5/84 , G11B2005/0021
Abstract: A glass substrate for use as a magnetic disk for heat assisted magnetic recording can restrain the occurrence of scratches when a magnetic head is in operation. The glass substrate for the magnetic disk includes a principal face on which an arithmetic average waviness Wa of a wavelength band of 1 to 3 mm is 2.15 Å or less.
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4.发明申请GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK FOR HEAT ASSISTED MAGNETIC RECORDING 有权用于磁辅助磁记录的磁盘和磁盘的玻璃基板公开(公告)号：US20160254018A1
公开(公告)日：2016-09-01
申请号：US15029117
申请日：2013-10-31
Applicant: HOYA GLASS DISK VIETNAM II LTD. , HOYA CORPORATION
Inventor： Masayoshi YOSHIDA , Masahiro KATAGIRI
CPC classification number: G11B5/722 , G11B5/7315 , G11B5/84 , G11B2005/0021
Abstract: It is to provide a glass substrate for a magnetic disk to be a source of a magnetic disk for heat assisted magnetic recording and a magnetic disk for heat assisted magnetic recording which can restrain the occurrence of scratches when a magnetic head is in operation.A glass substrate for a magnetic disk to be a source of a magnetic disk for heat assisted magnetic recording includes a principal face on which an arithmetic average waviness Wa of a wavelength band of 1 to 3 mm is 2.15 Å or less.
Abstract translation: 提供一种用于磁盘的玻璃基板作为用于热辅助磁记录的磁盘的源和用于热辅助磁记录的磁盘，其可以在磁头运行时抑制划痕的发生。 作为用于热辅助磁记录的磁盘源的磁盘用玻璃基板，其主面为1〜3mm的波长带的算术平均波纹度Wa为2.15以下。
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公开(公告)号：US20240062779A1
公开(公告)日：2024-02-22
申请号：US18259773
申请日：2021-12-28
Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
Inventor： Shinji EDA , Kenichi NISHIMORI
Abstract: A magnetic disk used in a hard disk drive device includes a substrate; a magnetic recording layer; and a heat insulating layer provided between the substrate and the magnetic recording layer. Even though a substrate has low heat resistance, as a result of providing the heat insulating layer, the substrate can be used as a substrate for a magnetic disk that can withstand heat treatment (high-temperature annealing).
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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
Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
Inventor： Masanobu ITAYA , Kinobu OSAKABE , Toshio TAKIZAWA
Abstract: 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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