Disk drive having reduced magnetic flux leakage
US8270119B2 · kind B2 · utility
0Cited by
6References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 28, 2009 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Nov 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5569
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a voice coil motor (VCM) of a disk drive, a coined feature formed on a ferromagnetic plate reduces magnetic flux leakage from a disk drive without increasing the weight of the drive or adding complexity to the manufacturing process. The coined feature is shaped and positioned to alter the path of magnetic flux lines produced by the VCM in a way that significantly reduces the flux leakage from the VCM. The coined feature may be formed without adding material to the ferromagnetic plate by the same stamping process used to fabricate the plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.