Optical disc having oscillating land and grooves
US6167022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Sep 21, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/211
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One or more optical discs, each having a ROM field having information with a length of at least one track formed in convex and concave pit rows, and a rewritable field capable of rewriting the information with a length of at least one track, an information unrecorded field having a length of at least one track located between the ROM field and rewritable field, the rewritable field having a spiral or concentric guide track oscillating in a radial direction, the ROM field having spiral or concentric convex and concave pit rows, and at least a part field at the rewritable field side of the information unrecorded field has a transition field having a spiral or concentric guide track oscillating in the radial direction continuously or intermittently and a track pitch To of the ROM field and a track pitch Tw between grooves and lands of the rewritable field have values such that To>Tw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.