INFORMATION RECORDING MEDIUM AND METHOD FOR MANUFACTURING SAME

摘要

An information recording medium is provided with the N number of information layers (N is an integer of 2 or more) on a substrate (1). Information is recorded and reproduced by irradiating each of the information layers (11, 12) with a laser beam (4). When the N number of information layers are permitted to be first information layer to an Nth information layer in sequence from an opposite side to a laser beam inputting side, the Lth information layer (L is an integer satisfying the inequalities of 2=L=N) included in the N number of information layers includes at least a recording layer (135) which can cause phase change by laser beam irradiation, a reflection layer (132) and a transmittance adjusting layer (131) in this order from the laser beam inputting side. The transmittance adjusting layer (131) includes at least one element (M) selected from among Ti, Zr, Hf, Y, Cr, Zn, Ga, Co, Bi, In, Ta and Ce. The transmittance adjusting layer also includes Nb and oxygen (O). The rate of content of Nb in the transmittance adjusting layer (131) is 2.9 atomic % or more.