Patent ID: 8980530
Filing Date: 2015-03-17
Classification: G11B

Abstract:
1. An optical information recording medium comprising; a plurality of recording layers each containing a recording material; and intermediate layers each provided between the recording layers, wherein the recording material comprises a polymer binder and a dye dispersed in the polymer binder and having a structure represented by the following formula: wherein a concentration of the dye in the recording material is in the range of 11.9-25.0 weight percent; and wherein each of the recording layers is configured such that when the recording layer is irradiated with a laser beam as a recording beam, the dye generates heat by multi-photon absorption of the recording beam and linear absorption of the recording beam not smaller than 1.5% per recording layer and not more than 5% per recording layer, and the polymer binder undergoes a change in shape by the generated heat, whereby an interface between the recording layer and the intermediate layer undergoes a change in shape to record information.