Patent ID: 6159572
Filing Date: 2000-12-12
Classification: B29C,B29D,B29L,G11B,Y10S,Y10T

Abstract:
An information recording medium, which comprises a substrate having a recording surface provided with emboss pits or guiding grooves; a reflective film formed on said recording surface of said substrate; and a first protective film formed on said reflective film;wherein both sides of said information recording medium are constituted by a first surface constituting an uppermost surface on said first protective film and by a second surface formed opposite to said first surface;said first surface is constituted as a light incident surface, thereby allowing an irradiated light beam to enter and reflect through said first surface, a recorded information being reproduced based on changes in light intensity of said reflected light beam; and whereina distance between said recording surface of said substrate and said light incident surface is smaller than a thickness of said substrate, and a surface roughness ""R"" of said light incident surface meets a relationship represented by the following formula (1):R.ltoreq..lambda./(8n) (1)where .lambda. is a wavelength of said light beam; and n is a refractive index of said first protective film to a light having said wavelength .lambda..