Sn ALLOY REFLECTION FILM FOR OPTICAL INFORMATION RECORDING MEDIUM FOR ONLY REPRODUCTION, OPTICAL INFORMATION RECORDING MEDIUM FOR ONLY REPRODUCTION AND SPUTTERING TARGET FOR FORMING Sn ALLOY REFLECTION FILM FOR OPTICAL INFORMATION RECORDING MEDIUM FOR ONLY REPRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide an Sn alloy reflection film for an optical information recording medium for only reproduction having excellent marking properties even in the case of low laser power, to provide the optical information recording medium for only reproduction and to provide a sputtering target for forming the Sn alloy reflection film for the optical information recording medium for only reproduction.;SOLUTION: A composition of the reflection film of a BCA mark 16 provided in an optical disk 1 for only reproduction is specified to be an Sn alloy containing a specified quantity of one or two kinds of Ni and Co to obtain the BCA mark having excellent basic characteristics of reflectance and environment resistance, and excellent marking properties even in the case of low laser power.;COPYRIGHT: (C)2008,JPO&INPIT