Optical disk having narrow and wide guide grooves
US4947384A · kind A · utility
45Cited by
5References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 12, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Apr 12, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24076
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information recorded at that part of the land.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.