Hydrodynamic bearing device, and spindle motor and information device using the same
US7495863B2 · kind B2 · utility
2Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2005 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Jul 30, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hydrodynamic bearing device has high reliability and is suitable for miniaturization through superior heat resistance and by utilizing a dynamic pressure-generating liquid with little loss due to evaporation. The hydrodynamic bearing device has at least one of a shaft structure and a sleeve having a dynamic pressure-generating mechanism. The dynamic pressure-generating liquid present in a gap between the shaft structure and the sleeve has a main component that is ionic liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.