Apparatus for reading and/or writing an optically readable information structure
US4423496A · kind A · utility
23Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1980 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Dec 10, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for reading and/or writing an optically readable information structure, arranged in information tracks, on a record carrier, comprises a beam deflection element which is controlled by a control signal obtained from a tracking servo system. The apparatus is provided with a position detection system for detecting the position of the deflection element, and the signal from this detection system is applied to an input of the servo system for generating a control signal which is independent of the position of the deflecting element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.