Optical recording medium
US7502308B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2003 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Jul 10, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10597
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium has spirally or concentrically formed tracks and capable of an optical recording. The optical recording medium includes a data recording and reproducing area divided into a plurality of zones in the radial direction. One zone is divided into a plurality of sectors respectively having an address area including pits having address information and a data are in which data is only present in grooves. The number of sectors forming each zone is different. An optical disc is formed so that an average reflectance Iadd of the address part and an average reflectance Idata of the data part satisfy a relation expressed by 0.7≦(Iadd/Idata)≦1.3 or 0.8≦(Iadd/Idata)≦1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.