US 2004/0001424 A1 · Information read/write medium

Abstract

A stack “0” having a recording layer serving to transmit a light beam includes a heat dissipating layer, a reflective layer, an enhanced layer, and the recording layer, which are formed in that order on an intermediate layer. The reflective layer is translucent to a light beam, while the heat dissipating layer has a thermal conductivity higher than that of the intermediate layer as well as a refractive index higher than or equal to that of the intermediate layer and less than or equal to a refractive index 3. The thickness of the heat dissipating layer is set to a value within the range of a predetermined condition defined in accordance with a refractive index, the wavelength of the light beam, and a given integer. Thus, an information read/write medium configured to enable information to be recorded/reproduced thereon/therefrom as well as to effectively cool a recording layer serving to transmit a light beam is provided.

Claims7

Dependent claims

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/50n)+(N×λ/2n)}<d<{(15λ/50n)+(N×λ/2n)}
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.

3 more elements

Dependencies are inferred from the claim text.

Information read/write medium

Life of this patent

Information read/write medium

Life of this patent

Abstract

Claims7