Phase change optical disc

摘要

A phase change optical disc includes a substrate (21) and a first dielectric layer (22) formed on the substrate. A recording layer (23) is formed on the first dielectric layer (22) to be capable of being converted into one of an amorphous state and a crystal state according to the power of an incident beam. A second dielectric layer (24) is formed on the recording layer (23). A reflective layer (25) is formed on the second dielectric layer (24). In the phase change optical disc, the first dielectric layer (22) is formed of a material having a refractive index of 2.7 or more with respect to the incident beam.