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. 11, 2011
Filed:
Nov. 15, 2007
Frank Drautz, Weissach im Tal, DE;
Frank Drautz, Weissach im Tal, DE;
Minebea Co., Ltd., Nagano-ken, JP;
Abstract
The invention relates to a spindle motor having a fluid dynamic bearing system that comprises a base (), a stationary shaft () connected to the base, a hub () rotatably supported with respect to the shaft and two bearing plates () that are disposed at a mutual spacing about the shaft and connected to the hub. A bushing () is provided that is disposed between the bearing plates and separated from them by a gap () at least partly filled with a bearing fluid. There are two stopper plates () that are fixedly connected to the shaft, each abutting one side of each bearing plate and separated from the bearing plate by a bearing gap () filled with bearing fluid. This results in two independent fluid dynamic bearing systems, each of which is disposed about a bearing plate. The motor is driven by an electromagnetic drive system.