| 摘要 |
PURPOSE:To obtain a rewritable data recording medium free from deterioration in characteristics by using a plasma-polymerized film of a pigment as a carbon film. CONSTITUTION:In a carbon film containing a substance which optically reversibly changes by an electromagnetic wave irradiation, the carbon film is a plasma- polymerized film of a pigment. The polymerized pigment film can be formed by any of film-forming methods including a plasma process, such as a reactive sputtering, a plasma-reactive vapor deposition, and a plasma CVD. The film thickness is particularly limited, but is preferably in the range of 10 to 1000nm. It is preferable that the substance which optically reversibly changes by an electromagnetic wave irradiation into the film is contained in the range of 5 to 95wt.%. If the substance which optically reversibly changes by an electromagnetic wave irradiation into the film is in fine particle form, the size of the fine particle is preferably 100nm or less. As a starting material for the plasma polymerized film, all pigments superior in heat resistance can be used, but a phthalocyanine or quinacridone pigment is suitable for a plasma polymerization because of its sublimating properties. |
