Voice coil motor magnets and method of fabrication thereof
US6770242B2 · kind B2 · utility
2Cited by
8References
7Claims
0Family size
Inventors
Key dates
| Filing date | Apr 26, 2002 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Aug 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K41/0354
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Permanent magnet for voice coil actuator motors used to actuate head-arm assemblies in small form disk drives are produced from a dispersion of prealloyed rare earth magnetic particles in a thermoplastic binder. Upon shaping of green parts the magnetic axis of the particles is aligned with the field lines of a magnetic field. Following extraction of the binder the green parts are sintered to net shape. Improved magnetic properties, smaller dimensions, better than tolerances and 100% material utilization are claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.