Optical information recording medium and its recording and method

Abstract

A reflectance increasing type optical information recording medium in which the crosstalk is inhibited in the land and groove recording. This optical information recording medium comprises a substrate having a groove and a land provided between adjacent grooves and a recording layer that is provided on the substrate and that changes the reflectance by irradiation with light beams. In this recording medium, the reflectance after recording is greater than the reflectance before recording. Moreover, the depth D of the groove is set to be in the range of λ/8n to 3λ/8n, where the wavelength of the light beam is λ and the refractive index of the substrate is n. And the difference, Δφ=φ1−φ0, between the phase φ1 of the reflected light after recording and the phase φ0 of the reflected light before recording is in the range of (−0.1+2 m) π to (0.1+2 m) π, where m is an integer.

Dependencies are inferred from the claim text.