Objective lens driving apparatus for driving an objective lens of an optical disk drive
US6343053B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Aug 25, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0935
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An objective lens driving apparatus having a focusing coil and a tracking coil arranged in a parallel relationship with a thin, flat shape so that both the focusing coil and the tracking coil can be moved by a single flat magnet. An objective lens supporting member supports the objective lens, and is movably supported on a stationary member. A drive motor is provided at least one side of the objective lens supporting member. A yoke is fixed to the stationary member, and a drive magnet is mounted to the yoke. The drive magnet has a flat surface parallel to both the focusing direction and the tracking direction, the flat surface having four single-pole areas each of which is magnetized in a direction perpendicular to the flat surface. A drive coil assembly including the focusing coil and the tracking coil is mounted on the objective lens supporting member. The drive magnet assembly has a flat shape so that the drive coil assembly faces the flat surface of the drive magnet in parallel relationship with a small air gap therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.