Patent ID: 6096400
Filing Date: 2000-08-01
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising a substrate, and a first dielectric layer, a recording layer of phase change type, and a second dielectric layer formed on one surface of the substrate in this order, wherein recording/reproducing beam is irradiated from the other surface of the substrate, whereinsaid medium has a light absorption coefficient at the wavelength of said recording/reproducing beam such that:Ac/Aa.gtoreq.0.8when light absorption coefficient in crystalline region is Ac and light absorption coefficient in amorphous region is Aa;said substrate has a groove and a land on its surface, and said groove has a width W.sub.G and said land defined between two adjacent grooves has a width W.sub.L such that:x=2W.sub.G /(W.sub.L +W.sub.G).gtoreq.1.03; andcrosstalk in the reproduction of said land X.sub.L from the groove and crosstalk in the reproduction of said groove X.sub.G from the land are such that:.vertline.X.sub.L .vertline..gtoreq.20 dB,.vertline.X.sub.G .vertline..gtoreq.20 dB, and.vertline.X.sub.L -X.sub.G .vertline..ltoreq.5 dB,when both the groove and the land are used for recording tracks.