Optical recording/reproducing medium, mother stamper for producing optical recording/reproducing medium and optical recording/reproducing device
US7242662B2 · kind B2 · utility
2Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2002 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Jul 30, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24082
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording and reproducing medium has grooves 2 formed along recording tracks and can be recorded and/or reproduced with irradiation of light L having a predetermined wavelength λ. When n assumes a refractive index of a medium extending from a light entrance end face to the grooves 2 of the optical recording and reproducing medium, a phase depth x of this groove 2 satisfies the following inequality:λ/16.14n≦x≦λ/4.99nand a ratio w/p between a width w of the groove 2 and a track pitch p satisfies the following inequality:0.391≦(w/p)≦0.594
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.