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:
Jul. 27, 2010
Filed:
May. 13, 2005
Applicants:
Rikuro Obara, Nagano, JP;
Hiroshi Yoshikawa, Nagano, JP;
Inventors:
Rikuro Obara, Nagano, JP;
Hiroshi Yoshikawa, Nagano, JP;
Assignee:
Minebea Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 17/02 (2006.01); F16C 32/06 (2006.01); B21K 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fluid dynamic bearing having a shaft () and a bearing sleeve () rotatably supported relative to each other. At least one of the shaft and the bearing sleeve is made of steel or stainless steel made of by weight C: 0.6˜1.20%; Si: 1.0% or less; Mn: 1.0% or less; Cr: 10.5˜18.0%; Mo: 1.0% or less; S.: 0.03% or less; and Fe. The dynamic pressure bearing surface () is formed by ridges () remaining in between multiple dynamic pressure grooves () formed by electrochemical machining.