| 摘要 |
PURPOSE:To obtain a recording medium which has a high erasing speed, coefft. of light absorption and difference in reflectivity between a crystal and non- crystal and has the high stability of the non-crystalline state at room temp. by specifying the average chemical compsn. of a rewriting type optical recording medium to the specific range expressed by specific formula. CONSTITUTION:The average chemical compsn. of the material layer of the optical recording medium constituted by forming an optical recording material layer which induces a reversible phase transition when irradiated with laser light on a substrate in a manner as to sandwich the same with a protective layer is specified to the compsn. expressed by formula I in which the value of (x) is specified to the range expressed by formula II. The coefft. of light absorption to the wavelength of the laser light is increased by taking advantage of the high crystallization rate of In2Te3 and adding Bi2Te3 to the compsn. and the mutual shortbacks are made up and the difference in the reflectivity between the crystal and the non-crystal and the stability of the non-crystalline state at room temp. is enhanced by specifying the range of the content thereof to formula II. The necessary characteristics are thereby stabilized overall as compared to the case of using the respective materials alone. |
