| 摘要 |
PROBLEM TO BE SOLVED: To enable to adjust a light flux distribution property without deterioration of luminous intensity considering of light sufferings. SOLUTION: In lamp units 3A to 3C, plural grooves 38A to 38C with a predetermined curvature in the front and back direction are formed at an inner side face of each of side plates 31 of respective holders, following a nearly concave curve profile of a reflecting mirror 4 in a side view wherein a desired light flux distribution property is obtained, and right and left side parts 41, 42 of the reflecting mirror 4 are removably engaged and retained. Then either of the grooves 38A to 38C is selected according to the light sufferings to surrounding environments, and the reflecting mirror 4 is engaged and retained by this groove. |
