Optical disk recording and readout system having read, write and coarse light beams
US4752922A · kind A · utility
17Cited by
15References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1984 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Jul 6, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system for writing and reading data from a rotating optical storage disk, comprising a first, second and third coherent light source, providing coarse seek, reading, and writing functions, the three writing sources sharing a plurality of optical elements in common, all cooperating to provide for the coarse seek, fine seek, focus and tracking functions of the device. The read and the write optical beams are optically coupled together to ensure proper spacing of a newly written track with regard to the previously written track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.