| 摘要 |
PROBLEM TO BE SOLVED: To substantially prevent the occurrence of peeling by falling shock or the change with time of a laminated optical disk with which reading of information for two layers from one surface side is possible. SOLUTION: This laminated optical disk is composed of a first substrate (polycarbonate) 30 on which the information pits to be read by a reading laser beam (wavelength 650nm) RL one formed which is transparent to this laser beam RL, a first information recording layer 10 which is formed on the information pit forming surface of this first substrate 30 and is composed of an inorg. dielectric substance (S1) having the refractive index (refractive index=4) larger than the refractive index of the first substrate 30 (refractive index 1.6) and a second substrate 40 which is stuck to the first substrate 30 across this information recording layer 10. |
