Patent ID: 6787211
Filing Date: 2004-09-07
Classification: B82Y,G11B,Y10T

Abstract:
An optical recording medium for carrying out at least one of record and reproduction of information by light irradiation comprising:a substrate having a concave-convex portion formed on a main surface on a side where the light irradiation is to be carried out; a film formation layer provided with a concave-convex surface corresponding to the concave-convex portion which includes at least a recording layer over the main surface of the substrate; and a light transmission flattening film having a transmittance to the irradiated light which is formed on the film formation layer through a hydrophilic material film; wherein, the concave-convex surface on a surface of the film formation layer is filled with the light transmission flattening film and is flattened and the substrate has a central hole, the film formation layer having the recording layer is formed by setting, as a non-film formation region for the film formation layer, a central part region across a predetermined width around the central hole over the substrate; and the hydrophilic material film is formed across the film formation layer and the non-film formation region of the central part region of the film formation layer.