Patent ID: 8867146
Filing Date: 2014-10-21
Classification: G02B

Abstract:
1. An imaging lens comprising, in order from an object side: a first lens group having positive refractive power; and a second lens group having positive refractive power, the first lens group being fixed with respect to an image plane, the second lens group being moved toward the object side to adjust a focus on a close object, and the following conditional expression being satisfied: where TLa denotes an air-converted total lens length of the imaging lens, Po denotes a distance from the image plane to an exit pupil in the imaging lens, and Σd denotes a distance along an optical axis between the most object side lens surface of the first lens group and the most image side lens surface of the second lens group, wherein the first lens group is composed of a plurality of lens components, and the lens component closest to the object side in the first lens group is a positive lens component.