| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device which can expand a light radiation range to a radiation object having a curved face shape while equalizing a luminance distribution and an illuminance distribution of a light guide body in the longitudinal direction.SOLUTION: In a lighting device 1 which is formed by arranging a light source in the vicinity of a light incident face of an end face of a light guide body in the longitudinal direction, the light guide body is constituted of a substantially-circular light guide rod 2 in which an axial core is set as a center in a cross section face shape, an external peripheral face of the light guide rod 2 is set as a first reflection face 2b, a part of the first reflection face 2b is cut and set as a flat plane second reflection face 2c along the longitudinal direction, a light dispersion part 4 is arranged at the second reflection face 2c, and a light emission face 2d having a recessed curved face shape opposing the second reflection face 2c is formed along the longitudinal direction. Furthermore, a boundary portion between the first reflection face 2b and the light emission face 2d is formed into an angle-R shape. |
