| 摘要 |
There is provided a phase-change type optical recording medium, including: a substrate; a recording layer formed on the substrate, phase condition of the recording layer being changed when a laser beam is radiated thereonto, to thereby record, erase or reproduce data into or from the recording layer; and a reflection layer formed on the recording layer for reflecting a laser beam having been radiated onto the recording layer. The recording layer is formed so that the following equation is established:wherein Rc indicates a reflectivity to be obtained when the recording layer is in crystal condition, Ra indicates a reflectivity to be obtained when the recording layer is in amorphous condition, and Rm indicates a reflectivity to be obtained when the recording layer is in mixed condition of molten condition and crystal or amorphous condition. For instance, the substrate, recording layer and reflection layer may be designed to have a thickness and/or made of particular material so that the equation is established. The phase-change type optical recording medium makes it possible to accurately accomplish verification by which it is confirmed whether data is properly recorded at both initial recording and over-recording.
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