| 摘要 |
PURPOSE:To obtain the titled medium having excellent weatherability by forming a photomagnetic recording layer on a spacer formed on a discoid transparent substrate, further forming a protective layer thereon, and allowing the protective layer to cover the side surfaces of the photomagnetic recording layer. CONSTITUTION:The spacer 2 is formed on the substrate 1, and the photomagnetic recording layer 3 and the protective layer 4 are successively formed thereon. A glass disk, etc., are used as the substrate 1, and a groove 11 for laser beam tracking is previously formed on the substrate 1. A material such as SiO2 and AlN which is optically homogeneous and transparent, having no anisotropy, and capable of shielding water and oxygen is used as the material of the protective film 4 and the spacer 2, and the protective layer 4 is formed to cover also the side surfaces op the photomagnetic recording layer 3. Consequently, the infiltration of water and the intrusion of oxygen from the side surfaces of the photomagnetic recording layer 3 can be prevented.
|
