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:
Jun. 25, 2013
Filed:
May. 26, 2009
Hiroki Yamada, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tsuyoshi Morita, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Takuro Iguchi, Kyoto, JP;
Troy Michael Herndon, San Jose, CA (US);
Norbert Steven Parsoneault, Boulder, CO (US);
Jeffry Arnold Leblanc, Aptos, CA (US);
Hiroki Yamada, Kyoto, JP;
Junya Mizukami, Kyoto, JP;
Tsuyoshi Morita, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Takuro Iguchi, Kyoto, JP;
Troy Michael Herndon, San Jose, CA (US);
Norbert Steven Parsoneault, Boulder, CO (US);
Jeffry Arnold LeBlanc, Aptos, CA (US);
Nidec Corporation, Kyoto, JP;
Seagate Technology LLC, Cupertino, CA (US);
Abstract
A fluid dynamic bearing apparatus includes a first minute gap, a second minute gap, a third minute gap, a fourth minute gap, and a fifth minute gap. A flow of a lubricating oil from the fifth minute gap to the fourth minute gap is caused by a plurality of dynamic pressure generating grooves arranged within the fluid dynamic bearing apparatus. This flow causes air bubbles mixed in the lubricating oil within the fifth minute gap to flow toward the third minute gap and be discharged to an outside through the third minute gap. In addition, a flow of the lubricating oil into the third minute gap caused by a centrifugal force accompanying rotation is inhibited.