The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2017
Filed:
Oct. 31, 2013
Applicants:
Hoya Glass Disk Vietnam Ii Ltd., Yen My, Hung Yen Province, VN;
Hoya Corporation, Shinjuku-ku, Tokyo, JP;
Inventors:
Masayoshi Yoshida, Kai, JP;
Masahiro Katagiri, Hokuto, JP;
Assignees:
HOYA GLASS DISK VIETNAM II LTD., Yen Province, VN;
HOYA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/73 (2006.01); G11B 5/72 (2006.01); G11B 5/84 (2006.01); G11B 5/00 (2006.01);
U.S. Cl.
CPC ...
G11B 5/722 (2013.01); G11B 5/7315 (2013.01); G11B 5/84 (2013.01); G11B 2005/0021 (2013.01);
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.