| 摘要 |
In order to improve the usage efficiency of light emitted by a light source for a light-radiating structure and in order to make more uniform the amount of light irradiated from the light-radiating structure towards each section of a reflection structure, an illumination device comprises: an integrating sphere arranged above the normal line of a surface to be illuminated; a straight-tube light source traversing the integrating sphere space, extending in the tube axial direction, and having a discharge segment extending in the tube axial direction; and a reflection structure provided between an emission port in the integrating sphere and the surface to be illuminated so as to surround the normal line, said reflection structure reflecting, towards the surface to be illuminated, light that has been radiated from the discharge segment, then diffusely reflected by a diffuse reflection surface, and irradiated from the emission port. The reflection structure has arranged therein at least one light-reflective area that reflects light towards the surface to be illuminated. The center of a section in the discharge segment that is contained in the space is outside an area in which at least some of the at least one light-reflective area in the space can be seen through the emission port. |
