Optical recording medium
US6673411B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jun 24, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recordable optical recording medium comprising a recording layer containing an organic dye which can absorb a laser beam and a metal reflective layer directly or via another layer on a transparent supporting substrate having a pre-groove and a pre-pit, wherein the organic dye has a refractive index nk of 2.2 or more at a reproduction wavelength &lgr;2; in relation to the reproduction wavelength &lgr;2, the depths of the pre-groove and the pre-pit on the substrates are more than &lgr;2/4; and the following equations are satisfied:0.25r≦wg≦0.38r;0.25≦wp/wg≦0.75;&thgr;gr≦&thgr;pr; and&thgr;pr≦&thgr;ptwherein r is a recording laser beam diameter represented by &lgr;1/NA where &lgr;1 is a recording wavelength [&mgr;m] and NA is a numerical aperture for an object lens; wg [&mgr;m] and &thgr;gr are a half value width and a cross-section tilting angle in a substrate radial direction for the pre-groove, respectively; and wp [&mgr;m], &thgr;pr and &thgr;pt are a half value width, a cross-section tilting angle in a substrate radial direction and a cross-section tilting angle in a tangential direction for the pre-pit, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.