Patent ID: 6961300

Claim:
A high density optical recording medium comprising: an incident layer on which light focused by a lens is irradiated; a first super-resolution layer for controlling the spot size of the irradiated focused light; a second super-resolution layer for controlling the spot size of the irradiated focused light; and a recording layer for recording information, wherein the first and second super-resolution layers are able to vary the spot size of transmitted light through change in optical transmittance with incident light power, and to vary the spot size of transmitted light complementarily in response to change in incident light power because of different threshold light intensities (temperatures) for the onset of change in optical transmittance, and in the first and the second super-resolution layers, the spot size of transmitted light increases with increasing incident light power, and in case of the first super-resolution layer, a threshold light intensity (or temperature) for the onset of change in optical transmittance is exceeded below a readout power for the recording medium, while, in case of the second super-resolution layer, a threshold light intensity is exceeded above a readout power and below a recording power.