| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium devoid of a defect, and the manufacturing method thereof by preventing occurrence of abnormal electrical discharge when a protective layer is deposited according to a sputtering method in order to produce the optical information recording medium having at least an optical reflective layer and the protective layer formed on a substrate in this order, and preventing peeling of the protective layer on the interface with the substrate. <P>SOLUTION: The optical information recording medium has at least the optical reflective layer that reflects laser light, an optical recording layer containing a photoabsorption material which absorbs laser light, the protective layer made of an inorganic material, and an optical transparency layer formed in this order on a major surface of the disk-shaped substrate having a spiral-shaped groove formed in the major surface thereof. The protective layer is a layer formed according to the sputtering method. An area in which the protective layer is formed is made wider than an area in which the reflective layer is formed, and made narrower than an area in which the optical transparency layer is formed, whereby the optical information recording medium for which abnormal electrical discharge and peeling of the protective layer are prevented is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT |
