| 摘要 |
PROBLEM TO BE SOLVED: To enable superior light distribution characteristics free of light non- uniformity by arranging plural polygonal reflection face blocks around a light source position and shaping each of the boundaries between the two adjacent blocks in the reflection blocks radially by setting the light source position as the center thereof. SOLUTION: An edge 9a around the reflection face of a reflector 9 is polygonal, and the center point thereof is a light source position 6. A light source bulb is covered with a shade 7, one piece of the rectangular top angle forming the surrounding edge is positioned downwardly of the light source position 6. The reflection face of the reflector 9 is partitioned into a number of reflection face blocks B1 to B45, and these blocks are formed on a free curvature face, respectively. A basic shape of the reflection face blocks B1 to B45 is hexagonal having a vertical parallel two sides. Since a direction of a step formed along the mutual boundary of each refection face block is substantially equal to a radiation direction with the light source position at the center thereof, the light quantity incident to the step is significantly low and faults due to the step can be reduced. |
