Information recording media.

摘要

An information recording medium (1) for use with focused laser beams modulated with recorded information signals comprises a substrate (3) having a recording layer (6) composed of at least two layers (7, 8), the first layer (7) being formed on the substrate (3) and the second layer (8) being formed over the first layer (7). The substrate (3) and the first layer (7) have the property of high transmittance to laser beams and the second layer (8) is composed of a metal which is predominantly a low melting point metal capable of absorbing the laser beams and readily forming an alloy with the material of the first layer (7), the thickness of the first layer (7) being such that the reflectance of the laser beams entering from the substrate side is lowered by the interference effect caused by repetitive multiple reflections. The metal of the second layer (8) is thus alloyed to the first layer (7) due to the focused irradiation of a recording laser beam through the substrate (3) on the recording layer (6) changing the conditions for the multiple reflections and changing the reflectance in the recording layer (6) as viewed from the substrate (3), thereby carrying out the recording of the information signals.