| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a phase transition type optical disk with improved recording sensitivity and thermal stability by turning the material of first and second dielectric films to ZzO-BN and turning them to the thickness of 50-200Å respectively. SOLUTION: On a substrate 11 of polycarbonate, a ZnO-h-BN first dielectric film 12, a GeSBTe recording film 13, a ZnO-c-BN second dielectric film 14 and an Al-Ti reflection film are successively laminated. In this case, the thickness of the first dielectric film 12 is formed to be 300Å and the thickness of the second dielectric film 14 is formed to be 100Å. In the optical disk manufactured in such a manner, a refractive index and a reflectance are high and a jitter value is low compared to a conventional optical disk. When the thickness deviates from the above-mentioned range, the refractive index, the reflectance and the jitter value are not satisfactory. |
