Magnetic disk apparatus
US6757131B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | May 31, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/038
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For a magnetic disk apparatus for reading and writing information to a magnetic disk in the present invention, the recessed portion of the cover of the magnetic disk apparatus has a two-level structure; the space between the inner surface of the recessed portion, corresponding to the region of the magnetic disk surface which the actuator arm does not traverse, and the surface of the magnetic disk is made as narrow as possible. The air flow generated in that space by the rotation of the magnetic disk is thereby suppressed and as a result, magnetic disk resonance is suppressed. Also, the noise level is further suppressed by having two layers of damping plates attached to the outer surface of the cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.