| 摘要 |
PURPOSE:To enable high-contrast reproducing with high reflectivity and to realize high-sensitivity recording by forming such a recording layer that consists of a first recording layer essentially comprising a specified dye, intermediate layer of a material having specified refractive index, and second recording layer of specified thickness essentially comprising the same material as that of the first layer. CONSTITUTION:The recording layer on the substrate 1 consists of the first recording layer 2, intermediate layer 3 and second recording layer 4. The layer 2 and layer 4 essentially consist of such an org. dye having the peak spectroscopic reflectivity around the recording/reproducing wavelength. The layer 3 is transparent for recording/reproducing light and has lower refractive index than that of the layer 4. Thickness of the layer 4 is determined to give the maximum reflectivity. Thereby, double reflection in the interface between the layers 3 and 4 is enhanced and the reflectivity can be significantly enhanced. Thus, high-contrast reproducing is realized as well as hgih-sensitivity recording. |
