Illumination apparatus using light guide

摘要

There is disclosed a light guide for guiding light from a light source in a longitudinal direction and radiating the light to illuminate an object to be illuminated, which comprises a diffuser for diffusing the light from the light source along the longitudinal direction of the light guide, and a radiator for radiating the light diffused by the diffuser in a predetermined direction. A light leakage preventing portion using total internal reflection is provided, for preventing light leakage other than via the radiator.