Spindle motor and disk drive apparatus
US8842386B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2013 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Dec 2, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K5/1675
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A base plate of a spindle motor includes a bottom plate portion and a wall portion. The bottom plate portion extends perpendicularly or substantially perpendicularly to a rotation axis. The wall portion extends in an axial direction from a radially outer edge portion of the bottom plate portion. The bottom plate portion includes a cup portion and an outer bottom plate portion. The cup portion is arranged radially inward of the wall portion, and includes a recessed upper surface. The outer bottom plate portion is arranged to extend between the cup portion and the wall portion. The base plate includes a first member made of a first type of metallic material, and a second member made of a second type of metallic material having a Young's modulus greater than that of the first type of metallic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.