Videodisc play-back apparatus with variable width beam
US4125859A · kind A · utility
16Cited by
7References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1976 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Nov 1, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Information play-back apparatus comprising a laser source, an information recorded medium, optical means for guiding a laser beam from the laser source to an information recorded track on the information recorded medium, and means for varying the size of the spot of the laser beam on the information recorded track in dependence on the position of the track on the information recorded medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.