Disc pack assembly having a laminate sleeve disposed between a s

Details Disc pack assembly having a laminate sleeve disposed between a s Disc pack assembly having a laminate sleeve disposed between a s

1991-01-10

1992-08-04

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 9703, 360 9808, 360 9912, G11B 17038, G11B 17022, G11B 582

Patent

active

051364506

ABSTRACT:
A disc pack assembly utilized in a Winchester hard disc drive includes a rotatable cylindrical spindle and at least one disc mounted on the spindle for rotation therewith. A laminate sleeve surrounds the outer diameter of the spindle and is disposed between the inner diameter of the disc and the outer diameter of the spindle. The sleeve includes a first layer of a relatively pliable material disposed immediately adjacent to the spindle outer surface, and a second layer of a relatively firm material secured to and generally surrounding the first layer. The sleeve forms a substantially uniform and continuous magnetic-flux insulating gap between the inner diameter of the disc and the outer diameter of the spindle to provide clearance between the disc and the spindle and prevent the inner diameter of the disc from abutting the outer diameter of the spindle due to thermally induced differential expansion of the disc and the spindle.

REFERENCES:
patent: 4754351 (1988-06-01), Wright
patent: 4764828 (1988-08-01), Gollbach
Product Brochure from ScotchMark Identification Systems for "Scotch" Brand #300 Laminating Adhesives Systems; dated Jan. 1979.
Product Brochure from Flourglas for a Unsintered PTFE Teflon Tape.
Product Brochure from Fralock for Kapton Polyimide Film.

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