Optical pick-up unit
US5007712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical pick-up unit, there is provided with a structure for supporting a holder holding at least an objective lens through a spring support assembly so that said holder is movable in both of a focusing direction and a tracking direction, carried on a carriage capable of traveling at a high speed in the tracking direction, a spring constant of the spring support assembly is so set as to be larger in the tracking direction than in the focusing direction, whereby an amount of a positioning error of the objective lens produced in the tracking direction when the carriage is driven at a high speed is reduced. As a result, by the thus reduced amount of the positioning error of the objective lens, the optical pick-up unit is improved in access time in comparison with the conventional optical pick-up unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.