Patent ID: 9191541
Filing Date: 2015-11-17
Classification: G02B,H04N

Abstract:
1. An illumination device comprising: a light source; and a columnar light guide including an incident surface provided at least one of both longitudinal ends of the light guide and allowing light emitted from the light source to enter the light guide therethrough, a diffusing surface forming one side surface of the light guide extending in a direction of an optical axis of the light entering the light guide through the incident surface, the diffusing surface having a plurality of light diffusion patterns provided in a row to diffuse the light having entered the light guide through the incident surface, and an exit surface located opposite to the diffusing surface to extend in the direction of the optical axis and allowing the light diffused by the diffusing surface to exit the light guide therethrough, wherein the light diffusion patterns have a prismatic shape rising toward the exit surface and are provided in a row on the diffusing surface from D