OPTICAL RECORDING MEDIUM, METHOD FOR PRODUCING THE SAME, AND DATA RECORDING METHOD AND DATA REPRODUCING METHOD FOR OPTICAL RECORDING MEDIUM

摘要

An optical recording medium (10) comprising a supporting substrate (11), a light transmission layer (12), and a first dielectric layer (31), a noble metal nitride layer (23), a second dielectric layer (32), a light absorption layer (22), a third dielectric layer (33), and a reflective layer (21) arranged between the light transmission layer (12) and the supporting substrate (11). The second dielectric layer (32) is principally composed of ZnS or a mixture of ZnS and SiO2, where the ratio of ZnS to the sum of ZnS and SiO2 is set to be not less than 60 mol% and not more than 100 mol%. The material of the second dielectric layer (32) has simultaneously high hardness and flexibility in addition to high thermal conductivity, providing excellent balance between the thermal conductivity and film hardness, and this enables a small recording mark to be formed in a correct shape.