Invention Application
- Patent Title: GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK FOR HEAT ASSISTED MAGNETIC RECORDING
- Patent Title (中): 用于磁辅助磁记录的磁盘和磁盘的玻璃基板
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Application No.: US15029117Application Date: 2013-10-31
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Publication No.: US20160254018A1Publication Date: 2016-09-01
- Inventor: Masayoshi YOSHIDA , Masahiro KATAGIRI
- Applicant: HOYA GLASS DISK VIETNAM II LTD. , HOYA CORPORATION
- Applicant Address: VN Yen My, Hung Yen Province JP Shinjuku-ku, 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 My, Hung Yen Province JP Shinjuku-ku, Tokyo
- International Application: PCT/VN2013/000012 WO 20131031
- Main IPC: G11B5/72
- IPC: G11B5/72 ; G11B5/84
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.
Public/Granted literature
- US09728217B2 Glass substrate for magnetic disk and magnetic disk for heat assisted magnetic recording Public/Granted day:2017-08-08
Information query
IPC分类:
