Patent ID: 6201783
Filing Date: 2001-03-13
Classification: G11B

Abstract:
A disk-like information recording medium, comprising:a substrate;a recording layer, provided on said substrate, for recording an information signal; anda light transmission layer laminated on said recording layer;wherein an information signal is recorded on said medium by making light incident on said medium from the light transmission layer side, wherein said substrate comprises:a core layer made from a resin; anda surface layer made from a resin and integrated with said core layer, said surface layer having on its one side plane information signals in the form of iregularities on the recording layer side and having a fluidity which is larger than that of said core layer where both said surface layer and said core layer are in a molten state at the same temperature,wherein said resin forming said surface layer of said substrate is a resin having a water absorption ratio of less than substantially 0.3%.