Optical recording information medium
US6576321B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Sep 19, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium comprising a recording and a metal reflective layers on a transparent substrate having a groove, wherein the recording layer comprises an azaporphyrin metal complex dye with 1 to 4 meso-nitrogen atoms as a main component; recording and/or reproduction can be conducted using laser beams with wavelengths of &lgr;1 and &lgr;2 which is shorter than &lgr;1; a refractive index n of the recording layer is 2.0 or more at &lgr;1 and 1.8 or more at &lgr;2 as well as an attenuation coefficient k of the layer is 0.04 to 0.20 at &lgr;1 and 0.30 or less at &lgr;2; and the groove has a pitch of 0.70 to 0.85 &mgr;m, a half-value width of 0.20 to 0.35 &mgr;m and an inclination angle of 45 to 65°:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.