Optical recording medium for land-and-groove recording system
US5978327A · kind A · utility
12Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Feb 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08541
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium in which information can be recorded in tracks formed by both lands and grooves provided between lands, and rows of prepits corresponding to preformat information in both adjacent lands and grooves are formed by deviating in the circumferential direction. Counting grooves for counting tracks are formed at both sides of the row of prepits for the land, the prepit for the groove has a depth or width different from that of the groove, the counting groove has a depth or width different from that of the groove, and the prepit for the land is formed narrower and/or shallower than the counting groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.