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US 6,555,196 B2Granted
Optical data recording medium and material for heat-resistant protection layer for the same
AssigneeRicoh Company, Ltd.
InventorHiroko Iwasaki
Life of this patent
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Abstract
In a material for a heat-resistant protection layer and constituting one of the components of a phase variation type recording medium , at least one compound having a thermal conductivity of higher than 10 W/m·deg inclusive in a bulk state is contained. This kind of material realizes a phase variation type optical data recording medium having a high erasure ratio and allowing data to be repeatedly recorded and erased a number of times by small power even at the time of high-speed recording and erasure.
Claims8
A data recording medium comprising:
- a substrate;
- a first protection layer having a thickness of 200 Å to 3000 Å and formed on the substrate;
- a recording layer formed on the first protection layer;
- and
- a second protection layer having a thickness of 200 Å to 3000 Å and formed on the recording layer the second protection layer being an uppermost protection layer,
- wherein a thermal conductivity of the first protection layer is lower than a thermal conductivity of the second protection layer.
3 more elements
Dependencies are inferred from the claim text.