Invention Grant
- Patent Title: Magnetic-disk glass substrate and magnetic disk
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Application No.: US14432184Application Date: 2013-09-30
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Publication No.: US09607647B2Publication Date: 2017-03-28
- Inventor: Masanobu Itaya , Kinobu Osakabe
- Applicant: HOYA CORPORATION
- Applicant Address: JP Tokyo
- Assignee: HOYA CORPORATION
- Current Assignee: HOYA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Global IP Counselors, LLP
- International Application: PCT/JP2013/076616 WO 20130930
- International Announcement: WO2014/051153 WO 20140403
- Main IPC: G11B5/73
- IPC: G11B5/73
Abstract:
A magnetic-disk glass substrate of the present invention has a pair of main surfaces, and an arithmetic mean roughness (Ra) for wavelength components of 10 to 50 nm of the surface of the main surfaces is 0.15 nm or less.
Public/Granted literature
- US20150248910A1 MAGNETIC-DISK GLASS SUBSTRATE AND MAGNETIC DISK Public/Granted day:2015-09-03
Information query
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