Patent ID: 9546773
Date: 2017-01-17
CPC Classifications: B29D,B29K,F21V,F21Y,G02B,G02F,H01L

Claim:
1. A surface light source apparatus comprising: a light emitting element that emits light; a light flux controlling member that controls light emitted from a light emitting element; and a light diffusing member that scatters light and allows transmission of light emitted from the light emitting apparatus, wherein the light flux controlling member comprises: wherein one of a grid convex part which arranges a plurality of strips of convex parts in a grid pattern and a grid concave part which arranges a plurality of strips of concave parts in a grid pattern, is formed in the back surface of the light flux controlling member, and wherein surface roughening treatment is applied to one of the strips of the convex parts and the strips of the concave parts.