| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the moving amount of an optical member in accordance with the variation of an irradiation angle by varying the irradiation angle by miniaturizing an entire shape and uniformizing a light-distribution characteristic at each zooming point. SOLUTION: A flash light discharge tube 2, a reflector 3, a first translucent optical member 4 to split an emitted luminous flux from the flash light discharge tube 2 into three optical paths and a second translucent optical member 5 to convert the emitted luminous flux from the first translucent optical member into a desired light- distribution characteristic are included A cylindrical lens surface is formed at the center part of the translucent optical member, and also plural cylindrical lenses are formed on the light-emitting surface side of the second translucent optical member. The flash light discharge tube 2, the reflector 3 and the first translucent optical member 4 are integrated by a holding case or the like, and a separating distance from the second translucent optical member 5 is changed, so that a condensing degree is successively changed. The translucent optical member 4 and the second translucent optical member 5 are separated most at a telephoto time, and they are brought into close contact at a wide-angle time.</p> |
