Disc pack assembly having a laminate sleeve disposed between a spindle and a disc, for reducing radial disc displacement
US5136450A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1991 |
| Grant date | Aug 4, 1992 |
| Priority date | — |
| Expiry date | Jan 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/1473
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.