Apparatus for driving objective lens
US4472024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1982 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Jan 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an apparatus for driving an objective lens which projects a light spot onto an information track recorded spirally or concentrically on a disc-shaped record medium to read out information, a lens holder for holding the objective lens is supported by an intermediate cylindrical member by means of a pair of upright leaf springs movably in a tracking direction, the intermediate cylindrical member is then supported by an outer fixed cylindrical member via a pair of spiral leaf springs movably in a focussing direction parallel to an optical axis of the objective lens, dampers made of elastic material are secured to the upright leaf springs and the spiral leaf springs so as to suppress resonance caused by the leaf springs. Therefore, precise focussing and tracing controls can be carried out without being affected by the undesired resonance of the leaf springs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.