Rewritable optical information medium
US6040066A · kind A · utility
15Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Dec 7, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rewritable optical information medium has a phase-change recording layer (3) on the basis of an alloy of Ge-Sb-Te-O, having the composition (Ge.sub.a Sb.sub.b Te.sub.c).sub.1-d O.sub.d, wherein: EQU a+b+c=1 EQU 0.0001 a d a 0.035 The addition of oxygen considerably speeds up the crystallization rate of Ge-Sb-Te materials. Such a medium is suitable for high speed recording (i.e. at least eight times the CD-speed), such as for DVD-RAM and optical tape. The amount of oxygen in the recording layer (3) can be used to tune the crystallization rate to the desired value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.