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:
Oct. 24, 1995
Filed:
Apr. 20, 1993
Applicant:
Inventor:
Yotaro Sanada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ; H02K / ; G11B / ;
U.S. Cl.
CPC ...
310 51 ; 310 / ; 360 9807 ;
Abstract
A spindle motor applicable to a magnetic disk drive and carrying a stack of magnetic disks thereon. When an armature oscillates due to a great current fed thereto, O-rings intervening between the armature and a shaft damp the oscillation before it is transmitted to a housing and a cover via the shaft. The O-rings, therefore, allow the motor to rotate at high speed while producing a minimum of noise.