| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-layered recording medium wherein the cooling performance of the recording medium and repetitive recording characteristics can be enhanced and a recording capacity can be made twice as compared to a conventional one. <P>SOLUTION: In the medium wherein recording and reproduction are performed at two recording layer structure bodies 101 and 201, the first recording layer structure body 101 has a radiation layer composed essentially of ZnS-SiO<SB>2</SB>and Ag and provided on a side opposite to a laser beam incident side, the second recording layer structure body 201 has the same structure body as the first recording layer structure body has except the radiation layer and a second radiation layer 207 composed of a metal material is provided at a part coming in contact with the second recording layer structure body and a substrate. The first and second recording layer structure bodies are layered via an intermediate radiation layer 108 coming in contact with the first radiation layer 107 and a separation layer 109 coming in contact with the second recording layer structure body side. Writing laser power to the second recording layer structure body is made intenser than that to the first recording layer structure body, and at the time of erasure, erasing power to the second recording layer structure body is made intenser than that to the first recording layer structure body. The ratio of the thickness of the intermediate radiation layer 108 to the thickness of the first recording layer structure body is specified to be 0.2 to 1.0. <P>COPYRIGHT: (C)2004,JPO |
