| 摘要 |
PROBLEM TO BE SOLVED: To enable to change light distribution even if it is a single light source. SOLUTION: By providing a ellipse shape reflective face 6, which catches light emitted forward and upward from a bulb, a paraboloidal shape reflective face 7, which reflects the light caught by the ellipse reflective face in the radiation direction and is positioned at where it does not interfere with a main reflective face, and a light distribution varying means 10 into the light beam of the above paraboloidal shape reflective face 7, changing of the light distribution is enabled, even if it is a single light source. |
