Apparatus for driving an objective lens
US6421191B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Dec 25, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0933
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An objective lens driving apparatus having a lens holder, elastic supports, and a drive unit. The lens holds an objective lens. The elastic supports are secured at one end to the lens holder and at the other end to a fixed section, thereby allowing the lens holder to move. The drive unit drives the lens holder in a direction parallel to an optical axis of the objective lens and in a plane perpendicular to the direction parallel to the optical axis. The drive unit has at least two magnets provided on the lens holder, a coil section secured to the fixed section, and a yoke. The yoke constitutes, a closed magnetic circuit, along with the magnets. In the drive unit, said at least two magnets are arranged, opposing each other, the coil section is located in a gap between said at least two magnets, and a center of the gap is aligned with a center of the coil section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.