Patent ID: 8233374

Claim:
A multi-layer optical disc comprising: three or more recording layers in a stacked state, wherein: among stacked reflectivity of respective recording layers with respect to a laser beam for recording/reproducing information, a stacked reflectivity of a first recording layer, on which information to be reproduced first is recorded, is larger than the stacked reflectivity of the remaining two or more recording layers, and the stacked reflectivity “R i ” of each recording layer in the stacked state to a laser beam entering from a data readout surface is expressed by the following equation: R i = ( ∏ k = i + 1 n - 1 ⁢ ⁢ t k ) 2 · r i , wherein: “n” indicates the number of the recording layers of the multi-layer optical disc, and “r i ” and “t i ” indicate individual reflectivity and transmittance in each individual recording layer L i (i−0, 1, . . . , n−1), respectively.