Magnetic disk drive spindle motor having plates to shield the mo

Details Magnetic disk drive spindle motor having plates to shield the mo Magnetic disk drive spindle motor having plates to shield the mo

1993-09-08

1995-01-03

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 1702

Patent

active

053791690

ABSTRACT:
A magnetic disk drive spindle motor includes a cylindrical spindle hub, a pair of cylindrical bearings, cylindrical bearing holders, a shaft, a housing, and dynamic pressure generating plates. The spindle hub stacks and supports an information storage medium in an axial direction and incorporates a first member constituting a rotary drive system. The bearings rotatably hold two ends of the spindle hub by outer rings. The bearing holders hold the outer rings of the bearings and rotate together with the spindle hub. The shaft holds inner rings of the bearings and fixes a second member constituting a rotary drive system so as to oppose the first member. The housing fixes and supports one end of the shaft. The dynamic pressure generating plates are formed in a disk-like form having a predetermined thickness and fixed on the shaft outside the bearings to oppose inner side surfaces of the bearings with small gaps, and generate dynamic pressures in the gaps between the dynamic pressure generating plates and the inner side surfaces of the bearings, thereby shielding the internal space of the motor from the outside.

REFERENCES:
patent: 4835637 (1989-05-01), Mach et al.
patent: 5177650 (1993-01-01), Jabbari

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