Patent ID: 9519121
Filing Date: 2016-12-13
CPC Classification: G02B

Claim Text:
1. An imaging lens, consisting of: a front group which consists of a negative first lens having a meniscus shape with a convex surface toward the object side, a negative second lens, a point along the optical axis at the image-side surface of which is more toward the object side than points on both ends of the effective diameter of the image-side surface, and a positive third lens; an aperture stop; and a rear group which is positive as a whole in this order from the object side, wherein the rear group consists of one positive lens and one negative lens; and conditional formula (1) below is satisfied: where f: the focal length of the entire system ω: a half angle of view L: the distance from the object-side surface of the first lens to the imaging plane along the optical axis (back focus corresponds to an air converted length), and the conditional formula (2) below is satisfied: where f f: the focal length of the entire system.