Patent ID: 8866177

Claim:
A microstructure for a light-emitting element, comprising a plurality of microscopic convex parts each having a circular bottom surface, wherein the convex part has a peak on a perpendicular line at a center of the bottom surface and is defined by a generatrix connecting the peak and a circumference of the bottom surface, the generatrix of the convex part is formed by monotonically reducing height from the peak to the circumference of the bottom surface, the height of the peak of the convex part is 0.67 to 1.15 times as large as a radius of the bottom surface, the height of the convex part at a position of ¾ of the radius of the bottom surface from the center of the bottom surface is 0.21 to 0.65 times as large as the radius of the bottom surface, and the height of the convex part at a position of 9/10 of the radius of the bottom surface from the center of the bottom surface is 0.04 to 0.38 times as large as the radius of the bottom surface.