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:
Nov. 05, 2002
Filed:
Aug. 24, 2000
Yasuhiro Yoshimura, Chiyoda, JP;
Yoshishige Endo, Tsuchiura, JP;
Katsutoshi Nii, Hitachi, JP;
Yoshihiro Satou, Chiyoda, JP;
Yoshiaki Yamauchi, Minori, JP;
Noriyuki Kumasaka, Oume, JP;
Kazuto Oyama, Hitachinaka, JP;
Hisahiro Miki, Chigasaki, JP;
Tomoki Hirata, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disk drive is realized, which omits running-in for stabilizing a change in a correcting function produced by sliding between balls and a rolling groove in an unbalance correcting mechanism, and prevents immobility and straying of balls, and which comprises a unit mechanism assembled by using 12 balls subjected to surface treatment with heptadecafluorodecyltrimethoxysilane and a turntable plated with a chemical nickel plating containing phosphorus and boron to have a thickness of 5 &mgr;m and by injecting 1 microliter of ester oil into the rolling groove, and further comprises a recess formed in a sidewall of the rolling groove of the unbalance correcting mechanism to prolong the service life of the correcting function.