Phase change optical recording medium
US6958180B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2003 |
| Grant date | Oct 25, 2005 |
| Priority date | — |
| Expiry date | Jul 28, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A phase change optical recording medium having a wide recording power margin and excellent durability to repetitive recording is disclosed. The medium includes a first protective layer, a recording layer, an interface layer, a second protective layer, and a reflective layer, the layers disposed on a transparent substrate, wherein the interface layer includes a mixture of ZrO2. Preferably, the medium further includes a second interface layer including the mixture of ZrO2 between the first protective layer and the recording layer. In another preferable aspect, the mixture of ZrO2 is represented by the following formula:[(ZrO2)100-α(X)α]β(Z)γ(ZnS)δwherein “X” represents an oxide selected from MgO, CaO, Sc2O3, Y2O3, and CeO2; “Z” represents an oxide selected from TiO2, SiO2, Al2O3, MgO, Ta2O5, and ZnO; “α” is 2-15 mol %; “β” is 40-100 mol %; “γ” is 0-60 mol %; “δ” is 0-60 mol %; and β+γ+δ=100 mol %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.