Patent ID: 9297983
Filing Date: 2016-03-29
CPC Classification: G02B

Claim Text:
1. An imaging lens comprising, in order from an object side to an imaging side: a first lens group having a positive refractive power; a second lens group having a positive refractive power; and a third lens group having a negative refractive power, wherein the first lens group includes a first lens having a negative refractive power and a second lens having a positive refractive power, an aperture stop being disposed in the first lens group, the second lens group includes one lens having a negative refractive power and one lens having a positive refractive power, the third lens group includes one lens having negative refractive power and a concave surface on the object side, the second lens group is moved away from the imaging side toward the object side as a focusing lens when focusing from a position at infinity to a position closer than infinity, the first lens group does not move while focusing, the following conditional expression is satisfied: where a distance between an object side surface of a lens disposed at a most object side in the first lens group and an imaging surface is L, and a maximum image height is Y′ and the imaging lens has seven or fewer lenses which constitute an entire system of an optical system.