Optical tape

摘要

Disclosed herein is an optical tape comprising: a substrate whose a center-line average roughness (RaB) on the surface of one side is not more than 0.005 mu m and the number of coarse protuberances having a height of not less than 0.10 mu m in the surface of that side is not more than 10 protuberances/cm2, and an optical recording layer formed on the surface whose the RaB is not more than 0.005 mu m.