Patent ID: 7354178

Claim:
A structure of illuminating unit, comprises: a point-like light-emitting device, having an optical axis; an initial-stage conoid-like reflective surface, having a convergent opening end and a divergent opening end, wherein the point-like light-emitting device is located at the convergent opening end and the optical axis is toward the divergent end for emitting light, the initial-stage conoid-like reflective surface and the optical axis include an initial-stage included angle; and a final-stage conoid-like reflective surface, having a convergent opening end and a divergent opening end, wherein the convergent opening end of the final-stage conoid-like reflective surface is coupled with the divergent opening end of the initial-stage conoid-like reflective surface, the final-stage conoid-like reflective surface and the optical axis include a final-stage included angle, wherein the initial-stage included angle is larger than the final-stage included angle, wherein the divergent opening end of the initial-stage conoid-like reflective surface in a circular shape is coupled with the convergent opening end of the final-stage conoid-like reflective surface, and the final-stage conoid-like reflective surface has the convergent opening end in the circular shape and the divergent opening end in a regular quadrilateral shape to form a mixed conoid-like surface.