| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which can sufficiently secure a reproduced signal S/N of a minute mark. <P>SOLUTION: The optical information recording medium includes a phase change layer. The conditions of a phase change layer irradiated with a laser beam to be used for reproduction of information include a state (A) of being dissolved, a state (B) of being crystallized after being dissolved, and a state (C) of being crystallized without being dissolved. In the optical information recording medium, RA/(RB+RC) is a predetermined value or more when setting a reflectivity of a super resolution medium in an area of (A) to be RA, a reflectivity of a super resolution medium in an area in the state (B) to be RB, and a reflectivity of a super resolution medium in an area in the state (C) to be RC. <P>COPYRIGHT: (C)2010,JPO&INPIT |
