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. 10, 2012
Filed:
Jan. 30, 2009
Tetsuya Maruyama, Kyoto, JP;
Makoto Kutsukake, Kyoto, JP;
Hirofumi Kojima, Kyoto, JP;
Michihiro Ito, Kyoto, JP;
Masayoshi Saichi, Kyoto, JP;
Tetsuya Maruyama, Kyoto, JP;
Makoto Kutsukake, Kyoto, JP;
Hirofumi Kojima, Kyoto, JP;
Michihiro Ito, Kyoto, JP;
Masayoshi Saichi, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A fluid dynamic pressure bearing includes a shaft arranged along a central axis, an annular member fixed to the shaft, a sleeve, a lubricant, and a lubricating film. A stepped surface is provided on the outer circumferential surface of the shaft. The annular member preferably includes a lower surface extending radially with respect to the central axis and arranged to make contact with the stepped surface in the inner edge portion of the lower surface. The sleeve preferably includes an upper surface axially opposed to the lower surface of the annular member. The lubricant is provided between the shaft and the sleeve and between the annular member and the sleeve. The lubricating film is provided on the lower surface of the annular member at least over a region lying radially outwardly of the inner edge portion of the lower surface.