Patent ID: 8026046
Filing Date: 2011-09-27
Classification: G11B

Abstract:
1. A method for producing a multilayer optical disk including a plurality of information storage layers, comprising: a mastering step of preparing a plurality of metal dies; and a replicating step of producing a base plate onto which a desired pattern is transferred using said plurality of metal dies and forming recordable/reproducible information storage layers, wherein the plurality of information storage layers include a first information storage layer having a first track groove wobbling at a first amplitude and a second information storage layer having a second track groove wobbling at a second amplitude, wherein said mastering step comprising: a step of preparing a plurality of substrates to which a photosensitive material is applied; a recording step of forming a latent image of a pattern including a wobbling track groove by irradiating a selected area of said photosensitive material with recording light; a developing step of producing a plurality of master disks having said pattern by developing said photosensitive material; and a step of producing said plurality of metal dies based on said plurality of master disks, and in said recording step, the amount of deflection of said recording light along the radial direction of the disk is changed for each substrate and the amplitude of wobbling of said track groove is thereby changed for the first and second information storage layers.