Voice coil motor with linearized force constant
US4908816A · kind A · utility
19Cited by
8References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08582
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A linear motor with uniform force constant across the full stroke length achieved by varying the width of the air gap face area of the permanent magnet such that the width is reduced towards the center of the magnet in relation to the widths at the ends thereof to compensate for reducing field strength at the magnet ends caused by fringing effects on the field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.