Patent ID: 8982431
Filing Date: 2015-03-17
Classification: G02B,H04N

Abstract:
1. An illumination apparatus comprising: a light source; a light guide having an entrance surface on which a ray of light from the light source is incident and an exit surface from which a ray of light passing through the entrance surface exits toward a surface to be illuminated; and a holding member configured to hold the light source and to hold the light guide via a fixing member, wherein an exit surface of the light source is perpendicular to a surface of the holding member contacting the light source, and wherein, within a cross section including a plane normal direction of the exit surface of the light source and a plane normal direction of the entrance surface of the light guide, the plane normal direction of the entrance surface of the light guide or a direction within a surface of the light guide contacting the fixing member and the plane normal direction of the exit surface of the light source or a maximum intensity direction in light emission of the light source are inclined relative to each other such that a ray of light from the light source in the maximum intensity direction is refracted at the entrance surface of the light guide in a direction away from the fixing member.