Patent ID: 6514591
Filing Date: 2003-02-04
Classification: G11B,Y10T

Abstract:
An optical information recording medium comprising a substrate and a multilayered film formed on the substrate, the multilayered film comprising a first information layer laminate, a separating layer, and a second information layer laminate in this order from a side of the substrate,wherein each of the first information layer laminate and the second information layer laminate comprises a recording layer in which an optical change is caused by irradiation of laser light, and in the first and second information layer laminates, signals can be recorded/reproduced on/from the recording layer by irradiating the recording layer with laser light through the substrate, the first information layer laminate comprises a first protective layer) the recording layer, and a second protective layer in this order from the side of the substrate, and at least one of the first protective layer and the second protective layer comprises at least two sub layers, the first information layer laminate further comprising an interface layer in contact with the recording layer, a thickness of the interface layer being not more than 40 nm, the at least two sub layers comprise a first sub layer and a second sub layer in this order from a side near the recording layer, and a heat conductivity of a material constituting the second sub layer is greater than that of a material constituting the first sub layer.