| 摘要 |
PURPOSE:To obtain an optical recording medium having high reliability by utilizing the reflectivity difference due to thermal diffusion between Al or Au and Ge in a write-once optical recording medium recordable only once by providing a recording layer consisting of an Al- or Au-layer and a Ge-layer. CONSTITUTION:A write-once optical recording medium is constituted so as to be recordable only once. For example, a recording layer 3 is laminated on the upper surface of a substrate 1 through a heat-resistance protective layer 2. In this case, the recording layer 3 is formed from an Al- or Au-layer 3-2 and a Ge-layer 3-1. The Ge-layer 3-1 is arranged on the side of the substrate 1 and the Al- or Au-layer 3-2 is arranged on the upper surface of the Ge-layer 3-1. Further, a Ge or Al oxide layer is not allowed to be present between the Ge-layer 3-1 and the A-layer 3-2. At the time of recording, Al or Au and Ge is mutually thermally diffused to generate large reflectivity difference to enable writing. |
