Patent ID: 7485355

Claim:
An optical information recording medium, comprising: a substrate; and at least n information layers (where n is an integer of at least 3) provided on the substrate, wherein each of the n information layers comprises a recording layer comprising Te, O and M, where M denotes at least one element selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi, and when the n information layers are represented as a first to a n-th information layers from a laser beam incident side, assuming that C(j) % denotes a concentration of oxygen atoms contained in the recording layer included in a j-th information layer (where j is an integer satisfying 1≦j≦n−1), C(1) to C(n−1) satisfy the following relationships: C (1)≧ C (2)≧ . . . ≧ C ( n− 2)≧ C ( n− 1), and C (1)≠ C ( n− 1).