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. 19, 2025
Filed:
Jun. 26, 2024
Hoya Corporation, Tokyo, JP;
Masao Takano, Akishima, JP;
HOYA CORPORATION, Tokyo, JP;
Abstract
A hard disk drive includes a magnetic disk, and an annular spacer. The annular space includes two main surfaces, an inner circumferential surface, an outer circumferential surface, and a chamfered surface present between the outer circumferential surface and each of the two main surfaces. The annular spacer is disposed such that one of the two main surfaces is in contact with the magnetic disk. At least one main surface of the two main surfaces includes an inclined region, and the inclined region is inclined in an outer circumferential region of the at least one main surface toward a boundary between the at least one main surface and the chamfered surface such that a surface height of the spacer gradually decreases toward the boundary. The magnetic disk has a thickness of 0.55 mm or less. A material of a substrate for the magnetic disk includes aluminum alloy.