Optical recording medium having servo area and groove section
US7167436B2 · kind B2 · utility
3Cited by
13References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 14, 2003 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | May 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0079
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an optical recording medium capable of detecting groove start signals and groove end signals with an inexpensive detection circuit and allowing quick, stable clock detection and tracking pull-in, which optical recording medium is constructed in such a way that the depth DG of the grooves satisfies DG/(λ/N)<0.16, where λ is a wavelength of a light beam and N is an index of refraction of a substrate, and that the distance Ls between the groove edge and the pit closest thereto satisfies Ls>1.2 FWHM, where FWHM is a full width at half maximum of the light beam in the track direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.