Patent ID: 6240060
Filing Date: 2001-05-29
Classification: G11B

Abstract:
A phase change optical recording medium, which comprises a substrate, a interference layer formed on the substrate and a recording layer formed on the interference layer, wherein;the reflectance of a crystalline state in the recording layer is lower than the reflectance of an amorphous state in the recording layer,the interference layer comprise a first layer, a second layer which is below the first layer and of which the dielectric constant differs from that of the first layer, and a third layer which is below the second layer and of which the dielectric constant differs from that of the second layer, andthe recording layer has a data region and an address region, and wherein the data region has plurality of tracks, and wherein after a recording and erasing operation is carried out, wherein the data region has crystal band and amorphous mark lines in the crystal band, and wherein the width of each amorphous mark line is equal to or narrower than the width of each crystal band.