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:
Apr. 28, 2009
Filed:
Aug. 09, 2006
Tomohiro Haga, Ehime, JP;
Junichi Nakamura, Ehime, JP;
Tomohiro Haga, Ehime, JP;
Junichi Nakamura, Ehime, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A hydrodynamic bearing device which can improve reliability by stabilizing a balance of dynamic pressures generated at a thrust bearing portion. The spindle motorincludes a hydrodynamic bearing deviceincluding a shaft, a sleeve, first and second thrust flangesand, first and second thrust bearing portionsandand thrust dynamic pressure generating groovesand. The thrust dynamic pressure generating groovesandare formed such that a plurality of groove portions are connected without being isolated from each other, and the groove depth becomes greater from the inner periphery toward the outer periphery.