Optical head for a videodisc player/recorder
US4298974A · kind A · utility
38Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 10, 1979 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | May 10, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/127
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head comprising a semiconductor laser array which is used as a light source, and an optical system which guides laser beams from the array to a predetermined recording medium. The beam from one lasing point of the array is modulated by predetermined information and is used as a recording beam, while the beam from another lasing point is continuously oscillated and is used as a playback beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.