Optical disk
US5383176A · kind A · utility
138Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | May 7, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10582
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk including concentric or spiral grooves, a first series of pits formed in the interrupted portions, and a second series of pits formed in portions of lands. Both of the first and second series of pits represent address information. The portions of the lands and the interrupted portions of the grooves are located in different radial directions. With this arrangement, even when the optical disk has a reduced track pitch, accurate address information is obtained, achieving a high-density recording optical disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.