Patent ID: 6700845
Filing Date: 2004-03-02
Classification: G11B

Abstract:
An optical disc comprising:a substrate; at least a first recording layer and a second recording layer being stacked on one side of the substrate; a protection layer for protecting the recording layer, among the first recording layer and the second recording layer, located farther from the substrate; and an optically transparent layer provided between the first recording layer and the second recording layer; wherein a reflectance of one of the first recording layer and the second recording layer is made higher than a reflectance of the other recording layer; wherein a recess/protrusion pattern is formed on the one side of the substrate and wherein the recording layer, among the first recording layer and the second recording layer, located closer to the substrate, covers the recess/protrusion pattern; wherein a further recess/protrusion pattern is formed on a surface of the protection layer facing the recording layer, among the first recording layer and the second recording layer, located farther from the substrate and wherein the recording layer located farther from the substrate covers the further recess/protrusion pattern; wherein the second recording layer and the further recess/protrusion pattern may optionally be pre-formed on one side of a sheet member and the sheet member being joined onto the first recording layer using the transparent layer as an adhesive layer.