Patent ID: 9170405
Filing Date: 2015-10-27
Classification: G02B

Abstract:
1. An imaging lens consisting of: a first lens group; a stop; and a second lens group in this order from an object side, wherein the first lens group consists of three or less lenses including a negative lens having a meniscus shape with its convex surface facing the object side and a positive lens cemented on the negative lens in this order from the furthest object side, and wherein the second lens group consists of a 21st lens group and a 22nd lens group in this order from the object side, and wherein the 21st lens group consists of two lenses of a 21-1st lens and a 21-2nd lens, and wherein the 22nd lens group consists of a positive lens, and wherein the 21-1st lens is a positive lens, an image-side lens surface of which has a convex shape facing an image side, and the absolute value of a curvature radius of the image-side lens surface of which is less than the absolute value of a curvature radius of an object-side lens surface thereof, and wherein the 21-2nd lens is a negative lens, an object-side lens surface of which has a concave shape facing the object side, and the absolute value of a curvature radius of the object-side lens surface of which is less than the absolute value of a curvature radius of an image-side lens surface thereof, and wherein the following conditional formulas (1) and (3) are satisfied: where TL: a distance on an optical axis from a most-object-side lens surface in an entire system to an image plane when a back focus portion is a distance in air, Y: a maximum image height, f2: a focal length of the second lens group, and f: a focal length of the entire system.