Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2007-02-20
2007-02-20
Heinz, A. J. (Department: 2627)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S098070, C360S099080
Reexamination Certificate
active
10845863
ABSTRACT:
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk. The spindle motor comprises a rotating component, a stationary component, and a first and second bearing assembly disposed between the rotating component and stationary component for rotating the rotating component about the stationary component, wherein the disk is attached to the rotating component. The bearing assemblies comprise a stationary component surface and a rotating component surface having a lubricant disposed there between. The first bearing assembly employs an anionic lubricant such that a first voltage forms between the stationary component surface and the rotating component surface when the rotating component rotates about the stationary component. The second bearing assembly employs a cationic lubricant such that a second voltage forms between the stationary component surface and the rotating component surface when the rotating component rotates about the stationary component. A polarity of the second voltage being opposite a polarity of the first voltage to thereby reduce the potential at the disk surface.
REFERENCES:
patent: 4885104 (1989-12-01), Sturwold
patent: 5214326 (1993-05-01), Yonei
patent: 5559651 (1996-09-01), Grantz et al.
patent: 5661353 (1997-08-01), Erdman et al.
patent: 5729404 (1998-03-01), Dunfield et al.
patent: 5844748 (1998-12-01), Dunfield et al.
patent: 6148501 (2000-11-01), Grantz et al.
patent: 6151189 (2000-11-01), Brooks
patent: 6181039 (2001-01-01), Kennedy et al.
patent: 6211584 (2001-04-01), Kurosawa et al.
patent: 6322252 (2001-11-01), Grantz et al.
patent: 6490137 (2002-12-01), Toyota et al.
patent: 6669369 (2003-12-01), Nottingham et al.
patent: 6678115 (2004-01-01), Khan
patent: 2003/0053250 (2003-03-01), Ishikawa et al.
Chue Jack M.
Subrahmanyam Jai N.
Heinz A. J.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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