REFLECTION MIRROR-CARRYING VESSEL

摘要

A reflection mirror-carrying vessel capable of improving light distribution characteristics and providing a sharp spot light. The reflection mirror-carrying vessel (1) having a beam angle of 25-45æ and formed on the inner surface of a reflection mirror (2) with a reflection surface (6) having an almost spheroidal surface basis shape. When the vertexes in a major-axis direction of the almost spheroidal surface are A, B and their focal points are F<SUB>1</SUB>,F<SUB>2</SUB>, and when an arbitrary point a distance, 0.75-1.65 times the line segment F<SUB>1</SUB>A, away from the vertex A is C, and a plane including the point C and perpendicularly crossing the major axis is P, a facet (9) is formed on the entire surface, on the vertex A side with respect to the plane P, of the reflection surface (6), with the remaining portion of the reflection surface (6) serving as a single mirror surface. When a direction from one end side toward the other end side of a reflection mirror (2) in the facet (9) is x-axis, a direction perpendicularly crossing the spheroidal surface is y-axis and a direction perpendicularly crossing the x-axis and the y-axis is z-axis, the facet (9) is curved with a first curvature R<SUB>1</SUB> in the x-axis direction and curved with a curvature R<SUB>2</SUB> in the z-axis direction.