| 摘要 |
The present invention relates to a linear lighting system with a linear light source. According to the invention, all the effective light around the optical axis emitted from the linear light source is introduced to a concave reflector so that the illumination is carried out only with the reflected light. The reflected light is controlled to be a converging or parallel beam of light so that a desired area is illuminated and the luminance is increased. In a mode of the invention, a cylindrical concave reflector 2 whose section taken vertical to a linear light source 1 is a part of an ellipse 2e having a first focus F1 at the linear light source 1 and a second focus F2 at an irradiation plane 3 (irradiation target point). The part of the ellipse covers an effective emission angle 2theta of the linear light source 1, and a reflected light produced at the part from a light within the effective emission angle 2theta is free of obstruction by the linear light source 1. In another mode, the cylindrical concave reflector 2 is a part of a parabola having a focus at the linear light source 1. The part of the parabola covers an effective emission angle 2theta of the linear light source 1, and a reflected light produced at the part from a light within the effective emission angle 2theta is free of obstruction by the linear light source 1.
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