Patent ID: 7704581

Claim:
A semi-reflective film or reflective film for an optical information recording medium comprising a Ag based alloy, wherein the Ag based alloy consists essentially 0.005 to 0.4% (at % unless otherwise noted) of Bi and 0.05 to 5% of Ge, optionally at least one rare earth metal element, and optionally at least one element selected from the group consisting of Cu, Au, Rh, Pd, and Pt at a total content of 0.1 to 3%, optionally 0.05 to 5% in total of Zn, optionally 0.05 to 5% in total of Al, optionally 0.05 to 5% in total of Ga, optionally 0.05 to 5% in total of In, optionally 0.05 to 5% in total of Si and optionally 0.05 to 500 in total of Ge and Sn.