| 摘要 |
PURPOSE:To permit the good discrimination of a guide part and recording part without having a relation of ruggedness therebetween by forming the guide part or recording layer to have the surface rougher than the surface of the other. CONSTITUTION:A substrate 11 is a light transmissive substrate consisting of a disk-shaped glass substrate 12 and a silicon oxide film 13 deposited on the substrate 12. The substrate has the guide part 14 formed to have partly the rough source and the recording part 15 formed to have surface having the smaller max. peak-to-valley height than the roughness of the guide part 14 on the surface of the film 13 of said substrate 11. The recording layer 16 consisting of Te which is an additional writing type recording material is deposited on the recording part 15 and a Te film 17 s deposited on the guide part as well. The reflectivity of the laser light irradiated from the glass substrate 12 side is larger in the recording part 15 so that the guide part 14 and the recording part 15 are discriminated. |
