Patent ID: 7843796
Filing Date: 2010-11-30
Classification: G11B

Abstract:
1. An optical information recording medium comprising: a read-only information recording portion; and a BCA (Burst Cutting Area) portion formed by laser marking, wherein a reflective film on an information recording surface of the read-only information recording portion and a reflective film on the BCA portion are formed of the same material, composition of the reflective film includes Ag as a main component, and includes at least one of Nd and Gd, and at least one of Sn and In, the composition of the reflective film includes at least one of Nd and Gd of 0.1 atom % or more and 3.0 atom % or less in total, the composition of the reflective film includes at least one of Sn and In of 3 atom % or more and 12 atom % or less in total, and recorded information is reproduced from the information recording surface of the read-only information recording portion and a BCA signal is reproduced from the BCA portion, using blue-violet laser reproducing light.