| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which reduces thermal loading. <P>SOLUTION: The optical information recording medium 10 has a base plate 11 on which pits are formed, and a super resolution layer 12 whose optical characteristics change with the temperature rise. An optical head for the wave length λ and an objective lens having a numerical aperture NA is used when reproducing an optical information recording medium. λ/(10n)<D<λ/(6n) is satisfied when the refractive index of the base plate 11 is n and the pit depth is D. Further, λ/(8NA)<L<λ/(4NA) is satisfied when the shortest pit length among the pits is L. <P>COPYRIGHT: (C)2009,JPO&INPIT |
