公开(公告)号：US20160254018A1

公开(公告)日：2016-09-01

申请号：US15029117

申请日：2013-10-31

Applicant: HOYA GLASS DISK VIETNAM II LTD. ,  HOYA CORPORATION

Inventor： Masayoshi YOSHIDA ,  Masahiro KATAGIRI

IPC: G11B5/72 ,  G11B5/84

CPC classification number: G11B5/722 ,  G11B5/7315 ,  G11B5/84 ,  G11B2005/0021

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.

Abstract translation: 提供一种用于磁盘的玻璃基板作为用于热辅助磁记录的磁盘的源和用于热辅助磁记录的磁盘，其可以在磁头运行时抑制划痕的发生。 作为用于热辅助磁记录的磁盘源的磁盘用玻璃基板，其主面为1〜3mm的波长带的算术平均波纹度Wa为2.15以下。