Phase change optical recording medium

Details Phase change optical recording medium Phase change optical recording medium

2005-10-25

2005-10-25

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064500, C428S064600, C430S270130

Reexamination Certificate

active

06958180

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 ZrO2between the first protective layer and the recording layer. In another preferable aspect, the mixture of ZrO2is represented by the following formula:in-line-formulae description="In-line Formulae" end="lead"?[(ZrO2)100-α(X)α]β(Z)γ(ZnS)δin-line-formulae description="In-line Formulae" end="tail"?wherein “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 %.

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