| 摘要 |
PROBLEM TO BE SOLVED: To realize excellent opening of beam, a clear spot and an illusion prevention by providing a specified number of small flat surfaces sectioning cross section perpendicularly to an axis line at the center on a wall part of a reflector and a reflection surface facing a light source between opening and providing a lens having a lenticular forming a specified number of spiral arm patterns extending from the center to an edge part. SOLUTION: A reflector 14 in which a wall part having void, an axis line and an opening edge part are provided and the contour is hollow shell-shaped glass of a paraboloid of revolution is provided. A sectioning number N of spirally small flat surfaces with a lamp axis line as a center is 16 to 64, preferably, 32 to 56. As a result, opening of beam that light of a light source 12 is induced by the reflector 14 does not become excessive and is increased. The number M of arm patterns formed by a lenticular distributed on a lens 16 of light transmitting glass engaged to the reflector 14 at the edge part is smaller than N and 5 to 20 is suitable. By slight decolimation of light before light enters the lens 16, a change in optical intensity surrounding beam edge part becomes gentle.
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