Pickup device for optical disk
US6342978B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2000 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In accordance with the present invention a pickup device for optical disks includes spring wires supporting displaceably in focusing and tracking directions a lens holder holding an objective lens. One set of more than two spring wires is provided for each side of the lens holder and a total of two such sets of spring wires are arranged parallel to each other. Of more than two spring wires of each set, at least one spring wire has a cross section allowing a spring constant in the focusing direction and that in the tracking direction to vary from each other and is also positioned farther or closer than the remaining spring wires away or to a centerline of the objective lens. As such the pickup device can ensure a sufficient displacement in the focusing and tracking directions and also control an inclination of the lens holder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.