Disk drive motor spindle hub assembly with separately formed hub ceramic flange attachment
US5917677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1996 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | May 7, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive motor spindle hub rotatable about a central shaft has a ceramic hub flange attached to a cylindrical hub portion. The ceramic hub flange has a peripherally raised area on which a first disc rests. Additional discs and spacers are alternatively stacked on top of the first disc. The spacers are made of ceramic material with an inner relieved portion. A ceramic clamp washer with peripherally raised area and an inner relieved portion is stacked on top of the first disc. A ceramic clamp washer with a peripherally raised area and an inner relieved portion and a clamp spring in cooperation with the hub flange apply force to hold the first disc and additional discs in place. The clamp force is applied away from the inner diameter of the discs while portions near the inner diameter of the discs are isolated from the hub flange, spacer and the clamp washer. A conductive centering sleeve exerts a radial force and connects the first disc and additional discs to the hub portion positioning them concentric and providing a conductive path to ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.