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:
Feb. 27, 2001
Filed:
Oct. 20, 1998
Applicant:
Inventors:
Takashi Kohno, Ibaraki-ken, JP;
Kenji Tomida, Odawara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 1/702 ;
U.S. Cl.
CPC ...
G11B 1/702 ;
Abstract
When a disc device employs a fluid bearing, vibrations can be decreased at a high-speed rotation. There are, however, problems of deterioration in bearing rigidity and leakage of lubricating fluid with increase in temperature. For this reason, a motor is disposed outside a housing, two shafts which differ in diameter from each other are joined with each other to form a fixed shaft, each of the two shafts is provided with a fluid bearing, a magnetic fluid is used as a lubricating fluid, and a magnetic seal is provided outside each bearing.