Optical recording medium having a relationship between groove width and track pitch
US7548505B2 · kind B2 · utility
5Cited by
18References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2002 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Nov 17, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording/reproducing medium having grooves formed along recording tracks and used for recording/reproducing when irradiated with light L with a specified wavelength λ, wherein the track pitch p of a groove is at least 200 nm and up to 350 nm, and a ratio wg′/p between the width wg of a groove and a track pitch p is at least 0.24 and up to 0.67.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.