Invention Grant
- Patent Title: Glass substrate for magnetic disk and magnetic disk for heat assisted magnetic recording
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Application No.: US15029117Application Date: 2013-10-31
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Publication No.: US09728217B2Publication Date: 2017-08-08
- Inventor: Masayoshi Yoshida , Masahiro Katagiri
- Applicant: HOYA GLASS DISK VIETNAM II LTD. , HOYA CORPORATION
- Applicant Address: VN 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 Yen Province JP Tokyo
- Agency: Global IP Counselors, LLP
- International Application: PCT/VN2013/000012 WO 20131031
- International Announcement: WO2015/066735 WO 20150507
- Main IPC: G11B5/73
- IPC: G11B5/73 ; G11B5/72 ; G11B5/84 ; G11B5/00
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.
Public/Granted literature
- US20160254018A1 GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK FOR HEAT ASSISTED MAGNETIC RECORDING Public/Granted day:2016-09-01
Information query
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