Multilayer optical disc
AssigneeSony Corporation
InventorsKotaro Kurokawa, Koichi Yasuda
Life of this patent
Estimating the term…
Abstract
The present invention is a multilayer optical disc formed of a plurality of information recording sections having a phase change recording layer. A first information recording section provided at a laser-incident side uses, as a recording material, a phase change recording material which uses Sb and Te as major components and satisfies their ratio of 2.3<Sb/Te≦4.0 according to the atomic ratio. Since this phase change recording material provides a fast crystallization speed, it is possible to stably record, reproduce, and rewrite an information signal at a high transfer rate.
Claims10
A multilayer optical disc comprising at least a first information recording section, an intermediate layer having optical permeability, and a second information recording section sequentially formed on a substrate and using laser irradiated from a side of the first information recording section, wherein
- the first information recording section includes a phase change recording material layer formed of a phase change recording material which uses at least Sb and Te as major components and satisfies their ratio of 2.3<Sb/Te≦4.0 according to the atomic ratio.
Dependencies are inferred from the claim text.