METAL MOLD, OPTICAL DEVICE, METAL MOLD FOR FORMING OPTICAL DEVICE, AND PROCESS FOR MANUFACTURING THE SAME

摘要

A metal mold for forming an optical device that while ensuring a light utilization efficiency required for optical device, attains suppressing of fluctuation among individual metal molds for use in the forming thereof; an optical device; and a process for manufacturing the metal mold for forming an optical device. The metal mold is one for forming an optical device with multiple orbicular zone structures, characterized in that the metal mold has a face having concentric multiple orbicular zone structures, and that each of the orbicular zone structures has a bottom face with given width in the radial direction of the orbicular zone structures, a side wall face and a flute connecting the bottom face with the side wall face, constructed of a curved surface of 0.5 to 2 µm radius of curvature.