| 摘要 |
PURPOSE:To largely reduce the time for crystallization by successively forming a base layer, recording layer, and protective layer on a substrate and roughening the interface between the base layer and the base layer side of the recording layer. CONSTITUTION:On a substrate 1 such as polycarbonate or glass with grooves, there are successively formed a base layer 2, recording layer 4 protective layer 5 by sputtering, vapor deposition, etc. The layers 2, 5 consist of various kinds of transparent dielectric materials or mixtures of these so as to amplify the difference of reflectance produced by the recording layer 4 and to prevent thermal deformation of the substrate 1 or recording layer 4 caused by repetetion of recording and erasing. The rough surface 3 is provided by inverse sputtering, ion milling, etc., after the base layer 2 is formed, and the state of roughness is controlled by conditions of inverse sputtering or ion milling according to the recording material. By forming the rough surface 3, time of crystallization can be reduced. |
