Optical information recording medium

An optical information recording medium comprising:

• a light-permeable substrate provided with guiding grooves, which is laminated with a metallic layer, a lower dielectric layer, a recording layer which changes its phase upon being irradiated with laser beams, an upper dielectric layer and a reflection layer in this order, the recording layer adjoining the lower dielectric,
• wherein each guiding groove on the substrate has a concave and a convex section, and wherein both of the concave and the convex section record information,
• and wherein the lower dielectric layer has a thickness smaller than a depth of the guiding groove.

An optical information recording medium comprising:

• a light-permeable substrate provided with guiding grooves, which is laminated with a first dielectric layer, a second dielectric layer, a recording layer which changes its phase upon being irradiated with laser beams, a third dielectric layer and a reflection layer in this order, the recording layer and the first dielectric layer adjoin each other at the convex section of each of the guiding grooves,
• each guiding groove on the substrate has a concave and a convex section, and wherein both of the concave and the convex section record information,
• wherein the first dielectric layer which has a higher thermal conductivity than the second dielectric layer, and wherein the second dielectric layer has a thickness smaller than a depth of the guiding groove.