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:
Dec. 21, 1999
Filed:
Jan. 27, 1998
Applicant:
Inventors:
Akihiro Nagata, Nagano, JP;
Shinji Kinoshita, Nagano, JP;
Assignee:
Sankyo Seiki Mfg. Co., Ltd., Nagano-ken, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 / ; 310 91 ;
Abstract
A spindle motor has a fixed member of a motor, a rotor rotatably supported with respect to the fixed member, a shaft provided on either the fixed member or the rotor, a first ball bearing fitted on a head side of the shaft and a second ball bearing fitted on a base side of the shaft and having an axial dimension larger than an axial dimension of the first ball bearing. A circumferential wall, preferably on the fixed member, has a small gap with an outer circumferential wall of an outer ring of the second ball bearing.