Yoke member for voice coil motor
US5202595A · kind A · utility
5Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Dec 31, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K41/0356
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A voice coil motor is disclosed which comprises a yoke member composed of a central portion forming magnetic path, left/right fringes and upper/lower fringes, a moving coil wound movably around the central portion of the yoke member, and permanent magnets being adhered on the upper/lower fringes of the yoke member and applying magnetic field to the moving coil, wherein the yoke member is formed by overlapping at least two members of different permeabilities so as to uniform each reluctance of lines of magnetic force being generated from the permanent magnets and flowing through the yoke member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.