OPTICAL INFORMATION RECORDING MEDIUM AND METHOD OF RECORDING BAR CODE-LIKE MARK.

摘要

PROBLEM TO BE SOLVED: To provide a reproduction type information recording medium by which a satisfactory reproduction signal can be obtained and which is provided with a plurality of information layers including one information layer to which a BCA mark can be worked. SOLUTION: A thermal conductivity of a material of other information recording layers than the one information recording layer is set to be 1.5 times as high as that of a material of the one information recording layer to which the BCA mark is to be worked or higher and heat diffusion in the other information recording layers is promoted to suppress the remainder of working trace. COPYRIGHT: (C)2005,JPO&NCIPI.