Substrate for information recording disk, mold and stamper for injection molding substrate, and method for making stamper, and information recording disk

摘要

A cavity surface-forming plate of a mold for injection-molding a plastic substrate is coarsely polished, and then a surface for defining a cavity is applied with electroless Ni-P plating. The surface of the plating is polished with abrasive grains to obtain surface roughness of Ra