Spindle motor and hard disc drive incorporating the same
US6771459B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2000 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Apr 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spindle motor includes a fixed base member, an outer cylindrical member made from a hollow tube, and an inner cylindrical member inserted in said outer cylindrical member. The inner and outer cylindrical members are arranged so that one of the outer and inner cylindrical member is fixed to the base member and the other is rotatable about a longitudinal axis thereof. A bearing assembly is provided for bearing the rotatable cylindrical member on the fixed cylindrical member. Also, drive means is provided for rotating the rotatable cylindrical member about the fixed cylindrical member. In particular, the fixed cylindrical member is made of ceramic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.