Medium til registrering af optisk information og registreringsfremgangsmåde

摘要

An optical information recording medium comprising a light transmitting substrate, a light absorptive layer containing at least one light absorbing substance formed on the substrate and a light reflective layer made of a metal film formed on the light absorptive layer, wherein an optical parameter represented by rho = nabsdabs/ lambda wherein nabs is the real part of the complex refractive index of the light absorptive layer, dabs is the average thickness of the light absorptive layer and lambda is the wavelength of a reading laser beam, is 0.6< rho <1.6.