Objective lens actuating device
US6639744B2 · kind B2 · utility
7Cited by
3References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
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.