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:
Jan. 03, 1995
Filed:
Sep. 08, 1993
Yotaro Sanada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A magnetic disk drive spindle motor includes a cylindrical spindle hub, a pair of cylindrical bearings, cylindrical bearing holders, a shaft, a housing, and dynamic pressure generating plates. The spindle hub stacks and supports an information storage medium in an axial direction and incorporates a first member constituting a rotary drive system. The bearings rotatably hold two ends of the spindle hub by outer rings. The bearing holders hold the outer rings of the bearings and rotate together with the spindle hub. The shaft holds inner rings of the bearings and fixes a second member constituting a rotary drive system so as to oppose the first member. The housing fixes and supports one end of the shaft. The dynamic pressure generating plates are formed in a disk-like form having a predetermined thickness and fixed on the shaft outside the bearings to oppose inner side surfaces of the bearings with small gaps, and generate dynamic pressures in the gaps between the dynamic pressure generating plates and the inner side surfaces of the bearings, thereby shielding the internal space of the motor from the outside.