PROJECTION LENS OPTICAL APPARATUS INCLUDING PROJECTION LENS AND METHOD FOR MANUFACTURING PROJECTION LENS

摘要

A projection lens PL comprises  in order from a projection side: a first lens component L1 which has positive refractive power and is biconvex; a second lens component L2 which has negative refractive power and is meniscus; and a third lens component L3 which has positive refractive power and has a convex lens surface facing the projection side  lens surfaces on the projection side and an object side of the first lens component L1 and lens surfaces on the projection side and the object side of the second lens component L2 being aspherical  and the following conditional expression being satisfied: 0.2 f/(-f2) 0.7 where f2 denotes a focal length of the second lens component  and f denotes a focal length of the projection lens.