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. 03, 2021
Filed:
Mar. 28, 2019
Applicants:
Hoya Corporation, Tokyo, JP;
Hoya Glass Disk Vietnam Ii Ltd., Hung Yen Province, VN;
Inventors:
Assignees:
HOYA CORPORATION, Tokyo, JP;
HOYA GLASS DISK VIETNAM II LTD., Yen Province, VN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/82 (2006.01); G11B 5/73 (2006.01); G11B 5/667 (2006.01);
U.S. Cl.
CPC ...
G11B 5/82 (2013.01); G11B 5/667 (2013.01); G11B 5/73921 (2019.05);
Abstract
A hard disk drive includes a magnetic-disk substrate in which an average value of squares of inclinations is 0.0025 or less and a frequency at which squares of inclinations are 0.004 or more is 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm.