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.:

US 7750519 B1

Expired

Date of Patent:

Jul. 06, 2010

Filed:

Oct. 28, 2008

Hydrodynamic bearing device, motor and information recording and reproducing apparatus in which same is used, and method for manufacturing shaft used in hydrodynamic bearing device

Applicant:

Shoichi Yoshikawa, Tottori, JP;

Inventor:

Shoichi Yoshikawa, Tottori, JP;

Assignee:

Panasonic Corporation, Osaka, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

Dang D Le

Int. Cl.

CPC ...

H02K 7/08 (2006.01);

U.S. Cl.

CPC ...

Abstract

A hydrodynamic bearing device is provided for a spindle motor used in a hard disk drive or the like with a good state of fastening and good fastening strength between a shaft and a fixed member. The hydrodynamic bearing device includes a shaft that has a cylindrical main shaft portion and a fixing portion provided at one end of the main shaft portion, a sleeve that has a bearing hole in which the main shaft portion is inserted in a rotatable state, and a fixed member that is fixed to the fixing portion of the shaft. A nitride layer is formed on the main shaft portion, and a nitride layer non-forming film is formed on the fixing portion.

Find Patent Forward Citations

Quick Actions:

Yoshikawa, Shoichi. (2010). Hydrodynamic bearing device, motor and information recording and reproducing apparatus in which same is used, and method for manufacturing shaft used in hydrodynamic bearing device (U.S. Patent No. 7750519). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7750519

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile