Patent ID: 6862740
Filing Date: 2005-03-01
Classification: G11B

Abstract:
1. An optical information recording medium comprising at least first and second recording layers, and a protective layer including a plurality of layers, wherein when first to kth layers (k≧2) in the plurality of layers in the protective layer between a surface of the optical information recording medium and the first recording layer are specified as a first protective layer, and first to mth layers (m>k) in the plurality of layers in the protective layer between the surface of the optical information recording medium and the second recording layer are specified as a second protective layer, when i is an integer satisfying 1≦i≦m; the refractive index of the ith layer in the protective layer at a wavelength of 405 nm is n when (a-1) a combined refractive index n of one layer which is substantially equivalent to the first protective layer and substituted for the first protective layer is specified as n=((n when (a-2) a combined refractive index n of one layer which is substantially equivalent to the second protective layer and substituted for the second protective layer is specified as n=((n the refractive index n