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:
Mar. 25, 2003
Filed:
Dec. 27, 1999
Harushige Osawa, Shiga, JP;
Hongbing Du, Shiga, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A head assembly supports an arm for angular displacement about an axis in a disk drive. The bearing assembly includes a fixed shaft , a plurality of bearings and , a sleeve and dampers . The bearings and are disposed about the shaft . The sleeve is coupled to the bearings and for angular displacement about the shaft , and one or more darpers are coupled to the sleeve. Each damper includes a plurality of holding portions and one or more damping masses the holding portions are arranged circumferentially about the axis of the shaft as an axis of rotation of the arm, and distance between each adjacent two damping portions is approximately equal to each other, each holding portion has an inner space. The damping masses are movably accommodated in the inner space of the respective holding portions. The energy of the vibration of the head and the arm is absorbed in a short time by movements of the damping masses and by friction between the damping masses and inner surface of the holding portion, and/or by collisions of the damping masses.