Phase-change type optical information recording medium

摘要

The phase-change type optical information recording medium includes a transparent substrate, a first protective layer on the substrate, a recording layer on the first protective layer, a second protective layer on the recording layer, and a reflective layer on the second protective layer. Assuming that minimum recording linear velocity is V1 and maximum recording linear velocity is V2, then a value of ratio I(V2) /I(V1) of a degree of modulation corresponding to the maximum and minimum linear velocities is between 1 and 1.2.