Patent ID: 8054727
Filing Date: 2011-11-08
Classification: B82Y,G02F,G11B,Y10T

Abstract:
1. An information recording medium having a substrate, and a recording unit capable of recording three-dimensionally a recording pits onto the substrate: wherein the recording unit includes n number of recording layers, where n is an integer equal to or larger than 4, on which information is recorded by using a two photon absorption phenomenon, and a plurality of intermediate layers laminated one on another with each of the recording layers; wherein the recording layer includes a recording material capable of recording at a photon mode; wherein the plurality of intermediate layers are substantially transparent at a wavelength λ wherein a light intensity of recording light incident onto a recording layer nearest to the substrate is more than 0.707 fold as much as a light intensity of recording light incident onto a recording layer farthest from the substrate; wherein an absorptivity A wherein a difference between a refractive index of the unrecorded region of the recording layers and a refractive index of the intermediate layers is larger than a difference between a reflective index of the recorded region of the recording layers and a refractive index of the intermediate layers at the wavelength λ wherein a transmittance T where n is an integer equal to or larger than 4, which represents the number of recording layers; and wherein the absorptivity A provided that T