Patent ID: 9151470
Filing Date: 2015-10-06
Classification: F21V,G02B,H04N

Abstract:
1. An illumination device comprising: a light guide including one end face for taking in light, a diffuse reflecting surface for diffusely reflecting the light taken in from the one end face, and a light exit surface for emitting the light that is diffusely reflected at the diffuse reflecting surface towards an irradiation surface; a light source facing the one end face of the light guide; and a reflector having another diffuse reflecting surface that reflects light from the light source toward the one end face of the light guide, the light exit surface of the light guide being formed into an arc-like shape, the diffuse reflecting surface being disposed at a position at which an optical axis normal line along which light passes through a center of a circle constituting the arc and emitted from the light exit surface is formed, the light source being mounted on a circuit board formed separately from the light guide and disposed at a position which is set on the optical axis normal line of the diffuse reflecting surface and shifted to the light exit surface side with respect to the center of the circle, wherein the light guide has, at the one end face, a flange portion that abuts against the reflector, and the reflector is held between the flange portion of the light guide and the circuit board so as to maintain a predetermined gap between the light source and the one end face of the light guide.