US 12,352,926 B2
Concave-convex structure, optical member, and electronic apparatus
Masanao Kikuchi, Tokyo (JP); Hiroshi Tazawa, Tokyo (JP); and Kazuya Hayashibe, Tokyo (JP)
Assigned to DEXERIALS CORPORATION, Tokyo (JP)
Appl. No. 16/955,496
Filed by DEXERIALS CORPORATION, Tokyo (JP)
PCT Filed Dec. 18, 2018, PCT No. PCT/JP2018/046600
§ 371(c)(1), (2) Date Jun. 18, 2020,
PCT Pub. No. WO2019/131336, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 2017-249061 (JP), filed on Dec. 26, 2017.
Prior Publication US 2020/0319377 A1, Oct. 8, 2020
Int. Cl. G02B 1/118 (2015.01); G02B 1/04 (2006.01)
CPC G02B 1/118 (2013.01) [G02B 1/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A concave-convex structure comprising:
a plurality of group portions each including a plurality of convexities provided in a surface of a base material, wherein average widths of areas occupied by the convexities at the surface of the base material are smaller than or equal to a wavelength belonging to a visible light band,
wherein heights of the convexities in each of the group portions increase gradually toward a center of the group portion, and each of the group portions is formed as a convex lens-like structure as a whole,
wherein each of the group portions is configured to function as a single microlens, a plurality of the convexities that constitute each of the group portions are configured to function as a moth-eye structure that has an anti-reflection function, and an entire concave-convex structure consisting of a plurality of the group portions is configured to function as a microlens array having the anti-reflection function by means of the moth-eye structure,
wherein a plurality of the group portions are arranged spaced apart from each other on the surface of the base material with a flat surface therebetween, and a spacing between adjacent group portions is wider than a spacing between adjacent convexities within each of the group portions.