| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information recording medium including an excellent transmittance adjusting layer that has a stable and high deposition rate and a high refractive index, as is conventionally provided. <P>SOLUTION: The information recording medium includes N information layers on a substrate 1, where N is an integer of two or more. Information is recorded/reproduced by irradiating each of the information layers 11, 12 with a laser beam 4. When the N information layers are referred to as a first information layer to an N-th information layer sequentially from the opposite side to the laser beam incident side, the L-th information layer included in the N information layers includes at least a recording layer 135 capable of undergoing a phase change through laser beam irradiation, a reflective layer 132, and a transmittance adjusting layer 131 in this order from the laser beam incident side, where L is an integer satisfying 2≤L≤N. The transmittance adjusting layer 131 contains at least one of Ti and Bi, Nb, and oxygen (O). In the transmittance adjusting layer 131, the content of Nb is 2.9 to 26.5 atom%. <P>COPYRIGHT: (C)2011,JPO&INPIT |
