Apparatus for recording and reading information tracks on an optical record carrier with a beam of radiation
US4546463A · kind A · utility
43Cited by
12References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1981 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Jul 10, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus is described for writing and reading information tracks in an information surface of a record carrier by optical radiation. The apparatus comprises two diode lasers, one of which produces the write beam and the other a read beam. By means of polarization sensitive device the write spot and the read spot formed on the information layer are projected at a very small and stable distance from each other and the beams reflected by the information layer are spatially separated. The separated beams are routed to separate detectors with residual cross-talk between the beams being eliminated by wavelength-selective filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.