摘要 |
PURPOSE:To improve especially the corrosion resistance of an optical recording layer consisting of an amorphous magnetic body and to obtain the titled recording medium having long service life by providing a metallic thin film which is transmittable to a beam of a light as a corrosion preventive layer in contact with the surface of an optical recording layer of the optical magnetic recording medium on the side where the beam of light is passed. CONSTITUTION:The thin film of an alloy of a rare earth and a transition metal such as a GdTbFe film 2 is formed on a light-transmittable substrate 1 of glass, plastics, etc., and then a metallic thin film 3 of Co, Cr, Ti, Ni, Al, Au, etc. having excellent resistance to humidity and oxidation is vapor-depisited on the film 2 to form a corrosion preventive layer. Then an interference layer 4, a reflector layer 5, and a protective layer 6 consisting of SiO2, etc. are successively formed on the layer 3, and the combined layers are stuck to a protective substrate 8 by using an adhesive layer 7 to obtain the optical recording medium. The recording is conducted by a beam of light irradiated in the direction as shown by the arrow A, and the reading is performed by the emitted light shown by the arrow B. The corrosion preventive layer 3 can be provided to both surfaces of the recording layer 2. However, in this case, a reflection preventive layer is provided on the substrate 1 side. The deterioration of the recording layer can be prevented even under high-temp. and high-humidity conditions in this way, and the meidium having excellent durability can be obtained. |