Optical information recording medium

An optical information recording medium comprising:

• a transparent substrate;
• a first protection film formed on said transparent substrate;
• a recording film, formed on said first protection film, for recording and erasing information by causing a reversible phase change between a crystalline state and an amorphous state in accordance with a difference in thermal hysteresis such as temperature rise and cooling upon being irradiated with a laser beam, and reproducing recorded information by detecting a change in optical nature accompanying the phase change in said recording film;
• a second protection film, formed on said recording film, for protecting said recording film together with said first protection film;
• a dielectric film, formed on said second protection film and having a refractive index lower than a refractive index of said transparent substrate, for controlling a reflectance characteristic and an absorption characteristic of said recording film;
• and
• a transparent reflective film, formed on said dielectric film and having a refractive index higher than the refractive index of said transparent substrate, for controlling a reflectance of light incident from said transparent substrate by setting a film thickness.

An optical information recording medium, comprising:

• a transparent substrate;
• a first protection film formed on said transparent substrate;
• a recording film, formed on said first protection film;
• a second protection film, formed on said recording film;
• a dielectric interference film, formed on said second protection film and having a refractive index lower than a refractive index of said transparent substrate;
• and
• a dielectric reflective film formed on said dielectric interference film and having a refractive index higher than the refractive index of said transparent substrate.