Optical information recording medium and method of designing its structure
US5545454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1995 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Mar 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Phase-change-type optical recording medium comprises a first dielectric layer, a recording layer made of a phase change material, a second dielectric layer and a reflecting layer wherein the thicknesses of the first and second dielectric layers are determined for a given thickness of the recording layer so that the following conditions are satisfied; EQU .DELTA.A+.DELTA.R.gtoreq.20% and .DELTA.A.gtoreq.5% wherein .DELTA.A=A(cry)-A(amo), A(cry), A(amo): light absorption rates of the recording layer in the crystal state and amorphous state, respectively, .DELTA.R=R(cry)-R(amo), R(cry) and R(amo): light reflection rates of the recording lates in the crystal state and amorphous state, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.