Invention Application
- Patent Title: MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK
- Patent Title (中): 磁条盘基板和磁盘
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Application No.: US14424261Application Date: 2013-06-28
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Publication No.: US20150213826A1Publication Date: 2015-07-30
- Inventor: Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
- Applicant: HOYA CORPORATION , HOYA GLASS DISK VIETNAM II LTD.
- Applicant Address: VN Hung Yen Province JP Tokyo
- Assignee: HOYA GLASS DISK VIETNAM II LTD.,HOYA CORPORATION
- Current Assignee: HOYA GLASS DISK VIETNAM II LTD.,HOYA CORPORATION
- Current Assignee Address: VN Hung Yen Province JP Tokyo
- International Application: PCT/JP2013/067944 WO 20130628
- Main IPC: G11B5/82
- IPC: G11B5/82 ; G11B5/73
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.
Public/Granted literature
- US09564166B2 Magnetic-disk glass substrate and magnetic disk Public/Granted day:2017-02-07
Information query
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