| 摘要 |
PURPOSE:To improve sensitivity and recording quality by forming a groove on the plane on one side of a transparent substrate, constituting a part on which the groove is formed of a thermosoftening member, forming a light absorptive reflection layer on the plane where the groove of the substrate is formed, and setting a prescribed ratio of a reflecting level for a laser beam projecting the depth and the width of the groove at the part where the groove is formed to the part where no groove is formed. CONSTITUTION:Groove parts 7a, 7b, 7c... are formed on the plane on one side of an optical information recording medium 1, and the transparent substrate 2 in which the parts where the groove parts 7a, 7b, 7c... are formed are constituted of the thermosoftening member is used. On the plane where the groove parts 7a, 7b, 7c... are formed, the light absorptive reflection layer 3 and a protective layer 4 are formed sequentially. The depth and the width of the groove parts 7a, 7b, 7c... of the recording medium 1 constituted in such way that the reflected light levels of the groove parts 7a, 7b, 7c... for a laser convergence beam projected from the substrate 2 side are set at values of 10-50% of that of the parts where no groove part 7a, 7b, 7c... are formed. |
