| 摘要 |
PURPOSE:To obtain subject recording medium which has improved S/N of read ing signal by providing on the surface of a substrate,one after another, an undercoat layer, an intermediate layer and a recording layer which enables writing and reading of informations, and all of these layers are consisting of specified materials. CONSTITUTION:On the surface of a substrate made of a glass plate etc. an undercoat layer consisting of high polymer such as polymethyl methacrylate, etc. which contains fluorine surfactant is formed, and then, on the surface of the above undercoat layer an intermediate layer consisting of high polymer such as polymethyl methacrylate, cellulose nitrate, etc. is formed, and further, on the surface of the intermediate layer a recording layer which enables writing and/or reading of informations by laser is formed, resulting in obtaining of subject recording medium. Additionally as for the fluorine surfactant of the above undercoat layer, it is preferable to the contained within the range of 0.005-5% by weight against the high polymer substance. |
