Objective lens actuating device
US6532118B2 · kind B2 · utility
11Cited by
2References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2001 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Dec 11, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0933
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an objective lens actuating device, a magnetic field generating part generates a magnetic field with a focusing coil in a gap formed by an inner yoke and an outer yoke and an auxiliary magnetic field generating part generates an opposite magnetic field in respect to the magnetic field which is generated in the gap towards the focusing coil, at both ends of the inner yoke vertical to the focusing direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.