Patent ID: 8690396

Claim:
A projection lens for lighting equipment, comprising: N number of lens parts, each of the lens parts corresponding to a central angle 2α degrees (where α=180/N, and N is an integer greater than or equal to 3) and being bilaterally symmetric in a rotationally asymmetric elliptical collimator lens, wherein the projection lens is integrally formed in a shape where N of the lens parts are circumferentially disposed so that vertexes of the lens parts are located at a same position in plan view, and wherein the projection lens has, on its outer surface, the N number of edges located between the lens parts adjacent to each other, and wherein a shape of a rear surface of the collimator lens is formed such that a sectional shape of the rear surface which appears in section along a first plane including the optical axis and a minor axis of the collimator lens and a second plane parallel to the first plane is a concave curve concave to a focus point of the collimator lens, and a sectional shape of the rear surface which appears in section along a primary plane including the optical axis and a major axis of the collimator lens and a secondary plane parallel to the primary plane is a convex curve convex to the focus point of the collimator lens.