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:
May. 04, 2010
Filed:
Oct. 31, 2005
Hydrodynamic bearing device, spindle motor, and method for manufacturing hydrodynamic bearing device
Takeyoshi Yamamoto, Niihama, JP;
Takeyoshi Yamamoto, Niihama, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Highly reliable hydrodynamic bearing device and spindle motor are provided as a result of improving cleanliness by using an iron metal having austenite structure, which is a non-magnetic body, and solving the problem of lowering of abrasion resistance due to low hardness. A shaft is formed using an iron metal having austenite structure, and a surface treated layer dispersed with solid lubricant is formed on at least a part of the surface of a shaft facing a sleeve by spraying fine particles of solid lubricant. Cleanliness is improved since the shaft is formed using an iron metal having austenite structure, which is a non-magnetic body. Further, since the surface treated layer dispersed with solid lubricant is arranged on the bearing surface, the abrasion resistance is enhanced and excellent bearing reliability is obtained.