Patent Number: 8,795,805

Title: Optical disc recording medium and method of manufacturing optical disc

Abstract: An optical disc recording medium includes a disc substrate, at least one recording layer which is disposed on one surface side of the disc substrate, a cover layer which is disposed on a laser incident surface side of the recording layer and which is composed of a light-transmissive resin layer, and a hard coat layer which is disposed for surface protection on a laser incident surface side of the cover layer and which is composed of a light-transmissive resin layer. The cover layer is formed such that its thickness decreases from the central portion to the peripheral portion of the disc, the hard coat layer is formed such that its thickness increases from the central portion to the peripheral portion, and the total thickness of the cover layer and the hard coat layer is substantially uniform from the central portion to the peripheral portion.

Inventors: Ohoshi; Toshio (Kanagawa, JP), Tanuprayogi; Reynard (Kanagawa, JP), Nakano; Jun (Tokyo, JP)

Assignee: Sony Corporation

International Classification: G11B 7/24 (20130101)

Expiration Date: 8/05/12018