Optical recording medium for short-wavelength of laser beam and read/write/erase method using the medium
US5472758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1993 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Aug 9, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium of a data rewritable type includes: a substrate; a first transparent dielectric layer formed on the substrate, having a refractive index substantially equal to the refractive index of said substrate; a second transparent dielectric layer formed on the first dielectric layer, having a refractive index greater than that of said first dielectric layer and having its thickness being not greater than 80 nm; and further includes an optical recording layer formed on the second dielectric layer, so that said first and second dielectric layers and optical recording layer are laminated in this order on said substrate, where the total film thickness of the first and second dielectric layers is set to be not smaller than 90 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.