| 摘要 |
PROBLEM TO BE SOLVED: To set so that an incident light flux is properly emitted on a light conductor, to miniaturize the whole lighting system and to uniform the light quantity distribution by arranging a diaphragm for restricting a light flux emitted from the light incident surface. SOLUTION: A light flux from a light source 1 is emitted on the light conductor inside light source part 4, and only a light flux passing through the opening part of an aperture 2 being a light shielding body inserted into a light conductor F is emitted on the light conductive part 3. The light flux propagates in the lengthwise direction by being totally reflected by the light conductor side surface, and while being reflected or propagated by the saw-toothed light reflecting plate 5, the light flux reaches the light emitting part 6 at an incident angle smaller than a critical angle, and is emitted outside the light conductor F to illuminate the illuminating object surface in a line shape. Thus, the light flux from the light source 1 is restricted by the aperture 2, the light flux incident on the light conductive part 3 through the aperture 2 is emitted at an incident angle larger than a critical angle on the light conductor side surface, and the light flux is eliminated from being directly emitted from the light conductor end part to uniform the light quantity distribution of an illuminating light flux. |
