Light guide plate with convex portions having low radius of curvature tips, or low surface roughness

摘要

A light guide plate made of a transparent resin includes a first main surface and a second main surface opposite to the first main surface. The first main surface has a surface portion provided with convex portions having a height in the range of 5×10⁻⁷ m to 6×10⁻⁵ m each and a pitch in the range of 5×10⁻⁷ m to 4×10⁻⁴ m. The light guide plate having tip portions of at least 80% of the total convex portions with a radius of curvature of 2×10⁻⁶ m or less, or the surface of the convex portions having a surface roughness of 3×10⁻⁷ m or less.