Optical disk, high density optical disk system, and high density recording/reproducing method using the optical disk
US4569038A · kind A · utility
34Cited by
15References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1981 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Dec 17, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24079
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk recording and reproducing system which uses an optical disk at least one side of which is formed with a spiral groove which has a V-shaped or inverted-trapezoid-shaped cross sectional configuration. Both the radially inward and outward sloped faces of the groove are used as recording tracks which are tracked or scanned with the spot of a light beam in the case of recording or reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.