Patent ID: 8133655
Filing Date: 2012-03-13
Classification: G11B,Y10S

Abstract:
1. An optical information recording medium, comprising at least one information layer that is provided on a transparent substrate and that includes a protective layer and a write-once recording layer that are disposed in this order from a side of the transparent substrate from which an optical beam is incident on the optical information recording medium, wherein the recording layer contains at least one selected from the group consisting of Cr—O, Zn—O, Ga—O, In—O, Sn—O, Sb—O, Bi—O, and Te—O, and the protective layer contains Zn—O and Cr—O, and when the total amount of all atoms other than an oxygen atom contained in the protective layer is taken as 100 atom %, the amount of atoms of Zn is 33 atom % to 96 atom % and the amount of atoms of Cr is at least 4 atom % but less than 50 atom %, in the protective layer.