| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting fixture in which irradiation unevenness can be reduced. SOLUTION: The lighting fixture comprises a lamp 1 as a light source, a fixture main body 2 for housing the lamp 1 inside, and a Fresnel lens 3 for condensing the light from the main body 2. The light condensed by the Fresnel lens 3 passes between the two sheets of the barndoor 4 for light shielding. The barndoor 4 can change the irradiation range of the light condensed by the Fresnel lens 3 by changing its direction. The non-lens surface of the Fresnel lens 3 is formed so that the non-effective light reflected at the non-lens surface after emitted from the lens surface of the Fresnel lens 3 may be distributed in the direction not crossing the optical axis of the Fresnel lens 3. The non-effective light emitted toward the outside of the irradiation range adjusted by the barndoor 4 is shielded by the barndoors 4, thereby irradiation unevenness can be reduced. COPYRIGHT: (C)2004,JPO&NCIPI |
