Deviation correction apparatus for optical disc light beams
US4566089A · kind A · utility
23Cited by
6References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1984 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Mar 15, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/093
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser beam 11 focused to a spot 12 by an objective lens 30 for following an information track 24 on a video disc is subject to three mutually orthogonal deviations; lateral or tracking, focus, and time axis or jitter. To correct these the lens is mounted in a second holder 9, in turn flexibly mounted by spring strips 13a, 13b to a first holder 1, in turn rotatably and slidably mounted to a base 4 by a shaft and bearing 3, 2. Various permanent magnets 7, 10 and coils 5, 6, 8 cooperable therewith are disposed such that selected coil energizations move the lens relative to the information track to correct any detected deviations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.