Invention Grant
- Patent Title: Magnetic-disk substrate and magnetic disk
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Application No.: US15401615Application Date: 2017-01-09
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Publication No.: US10283156B2Publication Date: 2019-05-07
- Inventor: Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
- Applicant: Masanobu Itaya , Kinobu Osakabe , Toshio Takizawa
- Applicant Address: JP Tokyo VN Yen Province
- Assignee: HOYA CORPORATION,HOYA GLASS DISK VIETNAM II LTD.
- Current Assignee: HOYA CORPORATION,HOYA GLASS DISK VIETNAM II LTD.
- Current Assignee Address: JP Tokyo VN Yen Province
- Agency: Global IP Counselors, LLP
- Main IPC: G11B5/73
- IPC: G11B5/73 ; 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.
Public/Granted literature
- US20170186459A1 MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK Public/Granted day:2017-06-29
Information query
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