Patent ID: 8426005

Claim:
A super-resolution optical information recording medium comprising a super-resolution layer and a recording layer stacked on a support substrate, with which reproduction of information is executed by using a light beam, wherein: the super-resolution layer has, as characteristics thereof, a first state which keeps a solid phase state for irradiation of the light beam and a second state with which an optical constant changes by being turned into a liquid layer state for irradiation of a light beam whose light intensity is higher than the light beam of the first state; reflectance in an unrecorded region of the recording layer under a state where the super-resolution layer is in the first state is defined as R 1 and reflectance of a region where data is recorded is defined as R 2 , whereas reflectance in an unrecorded region of the recording layer under a state where the super-resolution layer is in the second state is defined as R 3 and reflectance of a region where data is recorded is defined as R 4 ; and each reflectance in the recorded region and the unrecorded region of the recording layer is so specified that a ratio of a super-resolution signal intensity acquired in the second state region with respect to a background light interference intensity acquired in the first state region for the light beam is expressed as f 1 =|(R 4 −R 3 )/(R 2 −R 1 )| and specified to satisfy f 1 ≧1.8, and that a ratio of a super-resolution signal intensity acquired in the second state region with respect to a disk noise intensity acquired in the regions of each of the first state and the second state is expressed as f 2 =|(R 4 −R 3 )/(R 1 +R 2 +R 3 +R 4 )| and specified to satisfy f 2 ≧0.16.