Pickup actuator
US6584047B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/093
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pickup actuator capable of significantly reducing rolling of the area, including: a pickup base, a lens holder having an objective lens mounted thereon, and lens holder driving means for driving the lens holder in directions for focusing and tracking on the pickup base. The lens holder driving means includes at least one magnet, a yoke for concentrating the magnetic flux of the magnet in the direction of the magnetic flux, and a driving coil having a focusing coil and a pair of tracking coils positioned between the magnet and the yoke. The respective widths of the magnet and the yoke are set at a rate of 1:0.8-1.2. Accordingly, the uniform magnetic flux area of the magnetic flux can be widely distributed in the width's direction of the yoke. Further, the magnet is attached to one side of one yoke while being slightly lowered thereon, so that the center of the magnetic flux of the magnet is downwardly moved from its initial position to a distance corresponding to 4-12% of the height of the magnet, and the center line of the magnetic flux of the magnet and the center line of the focusing coil are aligned with each other, exactly. Further, the width of the magnet and the gap between…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.