Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1995-08-07
1996-08-27
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9702, G11B 17028, G11B 3314
Patent
active
055506895
ABSTRACT:
A magnetic fluid seal is provided by mounting an annular, axially polarized magnet mounted on the device base member and an annular ring pole piece with an inner diameter that cooperates with an outer diameter surface of the hub assembly to form a fluid gap that is radially outward and within the axial extent of the spindle bearings. The secondary gap of the seal assembly is within the bearing assembly sealed volume while the principal sealing gap is within the hub assembly to confine any debris or aerosols resulting from high rotational velocity or shock to be contained in proximity to the flux fields that can recapture any magnetic material. The assembly also inherently presents an effective conductive path to provide enhanced grounding of the rotating assembly through the magnetic fluid in the second gap which is not subject to impairment caused by bonding materials. The seal assembly design also provides for self loading of the magnetic fluid without permitting escape of smeared liquid beyond the region of the seal assembly.
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Boutaghou Zine-Eddine
Cossette Luke A.
Luoma Richard W.
Dempster Shawn B.
International Business Machines - Corporation
Lahtinen Robert W.
Ojanen Karuna
Renner Craig A.
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