Patent ID: 6906995

Claim:
An information read/write medium having a plurality of recording layers which enable information to be recorded thereon and reproduced therefrom using a light beam, the medium comprising: a reflective layer, a heat dissipating layer, and an intermediate layer, the layers being deposited for each of the recording layers for serving to transmit said light beam to allow information to be recorded on and reproduced from another recording layer, wherein said reflective layer is translucent to said light beam, said heat dissipating layer has a thermal conductivity higher than that of said intermediate layer as well as a refractive index higher than or equal to that of said intermediate layer and less than or equal to a refractive index of 3, and said heat dissipating layer has a thickness (d) which satisfies a relation given by the following expression, {(2λ/50 n )+( N ×λ/2 n )}< d <{(15λ/50 n )+( N ×λ/2 n )} where n is the refractive index of the heat dissipating layer, λ is a wavelength of said light beam, and N is a given integer.