Laser beam optical recording medium featuring several read/write levels
US6746746B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 18, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Dec 18, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The inventions relates to a laser beam optical recording medium which features several read/write levels, comprising a first half-transparent level and at least a second level, the first one being close to the laser transmitting source, each level comprising a phase changing material layer with two stable states controlled by a laser beam, where the phase changing material is a metallic alloy whose chemical formula writes as:[(GeyTe1-y)a(SbzTe1-z)1-a]1-b(In1-xTex)bwith:0.4≦y≦0.60.3≦z≦0.50.4≦x≦0.60.3≦a≦0.50.01≦b≦0.3the reflection coefficient of the first level being in the range from 10% to 30%, the transmission coefficient being at least 45%, the writing power being lower than 23 mW and the erasing power being lower than 10 mW.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.