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:
Apr. 09, 2002
Filed:
Oct. 12, 2001
Katsutoshi Nii, Hitachi, JP;
Kenji Tomida, Odawara, JP;
Hiroshi Nishida, Kanagawa-ken, JP;
Kouki Uefune, Odawara, JP;
Yuuichi Yanagase, Ibaraki-ken, JP;
Masaru Muranishi, Ibaraki-ken, JP;
Takashi Kouno, Ibaraki-ken, JP;
Kazuhiko Kawakami, Hitachinaka, JP;
Hisanobu Kanamaru, Hitachinaka, JP;
Noriyuki Kumasaka, Ome, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disk drive unit includes a rotary member, which has a spindle, and has an information-recording disk fixedly mounted thereon, and a bearing unit rotatably supporting the spindle. The bearing unit includes a radial bearing device, provided in opposed relation to an outer peripheral surface of the spindle, and a thrust bearing device provided in opposed relation to a distal end surface of the spindle. The radial bearing device has a concentric arc-shaped bearing surface, which is concentric with the circular outer periphery of the spindle, and a non-concentric arc-shaped bearing surface which is non-concentric with the circular outer periphery of the spindle. The disk drive unit further includes a motor for imparting a rotational force to the spindle, and a lubricating fluid filled in the bearing unit.