Patent ID: 10698182

Abstract:
The imaging lens consists of, in order from an object side: a first lens group that has a positive refractive power; a stop; a second lens group that has a refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. The first lens group has, successively in order from a position closest to the object side, a negative meniscus lens that is convex toward the object side, a lens that is convex toward the object side, and a lens that is concave toward the object side. The third lens group consists of a negative lens. During focusing from an object at infinity to an object at a shortest distance, only the third lens group moves to an image side along an optical axis. The imaging lens satisfies a predetermined conditional expression relating to a focal length of the first lens group and a radius of curvature of an image side surface of a lens closest to the image side in the first lens group.