| 摘要 |
<p>A rewritable optical data storage medium (20) for high-speed recording by means of a focused radiation beam is described. The medium (20) comprises a substrate (7) carrying a stack (2) of layers, which stack (2) comprises, a substantially transparent first auxiliary layer I1 (3), a substantially transparent second auxiliary layer I2 (5) having a thickness dI2, and a recording layer (4) of a phase-change material having a thickness dp and comprising at least a composition GexSnySb1-x-y, where 0.05 < x < 0.30 and 0.15 < y < 0.30. The recording layer (4) is interposed between I1 and I2. A third auxiliary layer I3 (6) with a thickness dI3 acting as a heat sink is being present at a side of I2 opposite to the side of the recording layer. The following formula is fulfilled lambdaI2/dI2 > 5* 108 W m-2 K-1, in which formula lambdaI2 is the heat conduction coefficient of the material of the I2 layer. Thus an optical data storage medium is provided capable of being recorded at a relatively high linear recording speed of about 35 m/s or more.</p> |
