Optical recording medium and optical recording method
US6333913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Oct 5, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium of phase change type wherein favorable recording/reproducing properties are realized in high density recording, in particular, when the minimum mark length is up to 0.6 .mu.m and the track pitch is up to 0.7 .mu.m is provided. An optical recording method wherein high transfer rate is realized in the use of such high density recording medium is also provided. The optical recording medium has a recording layer having a thickness d.sub.r of 10 to 18 nm, and the first dielectric layer comprises one or more unit dielectric layers and the number of the unit dielectric layers is m (m: an integer of 1 or more). The relation: ##EQU1## is satisfied when i-th unit dielectric layer from the substrate has a thickness of d.sub.i and a refractive index of n.sub.i at the recording/reproducing light wavelength of .lambda., and the recording layer in its crystalline state has a refractive index of n.sub.r. The second dielectric layer has a thickness D in the range of 10 to 50 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.