Stacked arms assembled in a head disk assembly

Details Stacked arms assembled in a head disk assembly Stacked arms assembled in a head disk assembly

1997-04-10

1998-03-24

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 555, G11B 2108

Patent

active

057319340

ABSTRACT:
A head disk assembly ("HDA") comprises an enclosure including a base and a pivot bearing cartridge having a shaft and a outer shell rotatable about the shaft. The outer shell has a cylindrical surface. The shaft is affixed to the base at a predetermined location. The enclosure has an internal volume with a limited height above the predetermined location. The cartridge has an elongated portion in the volume, the elongated portion having a height approximately equal to the limited height. The HDA further comprises a plurality of rotating disks, each having at least one recording surface. The HDA further comprises an arm stack comprising a plurality of arms, and a plurality of head gimbal assemblies. Each arm has a stacking portion and a cantilever portion. Each head gimbal assembly has one end attached to the cantilever portion of a respective arm and has an opposite end positioned adjacent a recording surface. Each stacking portion includes a first spring element and a second spring element, the spring elements being positioned to define a generally C-shaped bearing surface, the first spring element including a first compression-receiving surface and the second spring element including a second compression-receiving surface, each C-shaped bearing surface contacting a portion of the cylindrical surface. The HDA further comprises an overmolded coil assembly that includes a coil portion and an arcuate wall portion, the coil portion projecting perpendicularly from the wall portion and the wall portion including a first compression-supplying surface and second compression-supplying surface. The arcuate wall portion compressively locks the plurality of arms to the cartridge with each of a plurality of spaced-apart portions of the first compression-supplying surface compressively abutting the first compression-receiving surface of each arm in the arm stack, and each of a plurality of spaced-apart portions of the second compression-supplying surface compressively abutting the second compression-receiving surface of each arm in the arm stack. The arcuate wall portion has a height approximately equal to the height of the elongated portion of the cartridge, and the height of the arm stack is approximately equal to the limited height.

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