Apparatus for providing uniform attractive force to a magnetic disk hub in a magnetic disk drive
US5072321A · kind A · utility
7Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/028
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for rotating and driving a magnetic disk in which a hub of a magnetic disk is magnetically attracted against a hub support, and a driving pin provided on the hub support is engaged with an engaging hole provided in the disk hub. The hub support has a magnetic attractive surface which is high in magnetic flux density in the vicinity of the driving pin and continuously and gradually lowers in magnetic flux density as a function of distance from the driving pin, so that the magnetic disk can be attracted by an approximately uniform net attractive force over the entire surface of the hub support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.