| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device, in which a plurality of light sources are arranged on a circumference with a designated radius at designated intervals, capable of setting an outline of an irradiation range of the whole lighting device in a circular shape and reducing unevenness of luminance in the irradiation range of the circular shape. <P>SOLUTION: In the lighting device in which the plurality of light sources 1a, 1b, and 1c are arranged on the circumference of a reference circle with a designated radius at designated intervals, a concentric circle of the reference circle larger than the radius of the reference circle is set up as an outer peripheral circle, and a range surrounded by the outer peripheral circle is demarcated as an irradiation range of the lighting device. When paying an attention to one light source (for example, 1a), a range surrounded by a vertical bisector of a line segment connecting between the light source 1a and the light source adjacent to the light source 1a and the outer peripheral circle is demarcated as an irradiation range of the light source 1a, and a reflector 6a for emitting by reflecting the light from the light source 1a is arranged in the surrounding of the light source 1a within the irradiation range of the light source 1a. The reflector 6a has curved surfaces emitting by reflecting the light from the light source 1a in a direction parallel to an optical axis of the light source 1a and corresponding to distances from the light source 1a as reflecting surfaces. <P>COPYRIGHT: (C)2012,JPO&INPIT |
