Micro lens array and a method of manufacturing a replication mold for the same

摘要

The micro-lens array in which a plural of convexly-protruded micro-lens are closely arranged two-dimensionally and a plural of convex sub-lenses having a curvature-radius smaller than that of the micro-lens are protrusively formed on the surface of each micro-lens has a large view angle, since D_sav/D is in a range from 0.1 to 0.3 where D is the micro-lens bottom face width obtained by halving the summation of the maximum and the minimum width which are measured along the line passing through the center of the bottom face of the micro-lens; D_s is the sub-lens bottom face width obtained by halving the summation of the maximum and the minimum width which are measured along the line passing through the center of the bottom face of the sub-lens; and D_sav is the average sub-lens bottom face width obtained by averaging a plural of the sub-lens bottom face widths D_s.