RESIN MOLDING BASE MATERIAL AND MOLD FOR OPTICAL DISC

摘要

PURPOSE:To eliminate warpage of a resin molding base material in the resin molding base material for an optical disc used as an optical information recording medium. CONSTITUTION:Facing to a molding channel of a stamper holder part formed on the signal forming face 2 of a resin molding base material 1, the similar molding channel is also formed on the opposite side of the signal forming face of the resin molding base material 1. Influence to warpage generated during molding of the resin molding base material 1 and warpage caused by moisture absorption is relaxed and an optical disc with little warpage can be obtd.