Voice coil motor
US5177383A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Dec 31, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08582
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A voice coil motor is disclosed which conveys a head of optical or magneto-optical disk drive or magnetic disk drive as a kind of a linear motor. The motor comprises a yoke member composed of a central portion, upper/lower fringes and left/right fringes forming magnetic paths, permanent magnets being adhered on the upper/lower fringes of the yoke member and each having an air gap with respect to the central portion. A moving coil is wound slidably around the central portion of the yoke member, and a shorted turn offsets the magnetic flux due to the current flowing in the moving coil, wherein the shorted turn has a plurality of fins on its conductive sleeve-shaped body and is disposed primarily in the yoke member except the section where the moving coil moves. The motor demonstrates an excellent control function while generating a maximum amount of thrust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.