| 摘要 |
PURPOSE:To relieve the restriction on the recording material to be used for a recording layer by laminating the recording layer which contains a thermally decomposing material and a metallic layer which absorbs a laser beam to some extent on a substrate. CONSTITUTION:The metallic layer 3 to be provided on the recording layer 2 has the reflectivity which is high to some extent; in addition, the layer is required to make photo-thermal conversion by partly absorbing the laser beam; therefore, this layer is required to have some absorption to the laser beam. The reflectivity in the laser wavelength of the metallic layer 3 is consequently required to be >=70% and <=85% in order to satisfy both of the above-mentioned requirements. On the other hand, the recording layer 2 causes a physical change, such as decomposition or change in properties, by the heat generation of the metallic layer 3. The thermally decomposing material which has no absorption in a laser wavelength region is used as the recording material. |
