Magnetic fluid seal and ground path for low profile disk drives

Details Magnetic fluid seal and ground path for low profile disk drives Magnetic fluid seal and ground path for low profile disk drives

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.

REFERENCES:
patent: 4526379 (1985-07-01), Raj
patent: 4694213 (1987-09-01), Gowda et al.
patent: 4824122 (1989-04-01), Raj et al.
patent: 5051853 (1991-09-01), Hosoya
patent: 5061868 (1991-10-01), Iwazaki et al.
patent: 5165701 (1992-11-01), Koba
patent: 5238254 (1993-08-01), Takii et al.
patent: 5323076 (1994-06-01), Hajee

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