In the photographing glass lens which consists of with the 1st glass lens

摘要

PROBLEM TO BE SOLVED: To provide a photographic lens having minimal aberration fluctuation caused by magnification fluctuation, and having high optical performance, and to provide an inspection device including the photographic lens.;SOLUTION: A photographic lens includes in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having positive refractive power; wherein the first lens group includes a first-a lens group G1a having positive refractive power, a diaphragm SP and a first-b lens group having positive refractive power. The first-a lens group includes a positive lens L1 with a convex surface directed to the object side, a positive lens L2 with a convex surface directed to the object side, and a negative lens L3 with a strong concave surface directed to the image side. The first-b lens group includes a negative meniscus lens L4 with a concave surface directed to the object side, and a positive lens L5. The second lens group includes a biconcave lens L6 and a positive meniscus lens L7 with a convex surface directed to the image side. In the case of focusing from an object at infinity to an object at a close distance, the first lens group and the second lens group move toward the object side by different moving amount respectively, so as to increase a distance between the first lens group and the second lens group. The photographic lens satisfies appropriately set conditions.;COPYRIGHT: (C)2012,JPO&INPIT