Patent ID: 6716507
Filing Date: 2004-04-06
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising:a substrate, a first protective layer, a recording layer, a second protective layer, a light absorbing and heat generating layer, a third protective layer and a reflection layer laminated in order; a second heat conductive distance d2 between the light absorbing and heat generating layer and the recording layer, wherein heat is transmitted from the light absorbing and heat generating layer to the recording layer through the second protective layer, and a third heat conductive distance d3 between the light absorbing and heat generating layer and the reflection layer, wherein heat is transmitted from the light absorbing and heat generating layer to the reflection layer through the third protective layer, wherein d2&lE;d3<30Ã—10âˆ’9 (m); d2=(t2/&sgr;2) (m) and d3=(t3/&sgr;3) (m) respectively, where t2 is a thickness of the second protective layer, t3 is a thickness of the third protective layer, &sgr;2 is a heat conductivity of the second protective layer, &sgr;3 is a heat conductivity of the third protective layer, and wherein &sgr;2 and &sgr;3 are expressed in a value relative to a heat conductivity &sgr;1 of ZnS(80)â€”SiO2(20) being 1.0.