Patent ID: 9297985
Filing Date: 2016-03-29
CPC Classification: G02B

Claim Text:
1. A zoom lens comprising, in order from an object side to an image side: a first lens unit having a negative refractive power; and a rear lens group having a positive total refractive power and comprising at least one lens unit configured to have an interval between the first lens unit and the rear lens group at a telephoto end of the zoom lens smaller than another interval between the first lens unit and the rear lens group at a wide angle end of the zoom lens, wherein the first lens unit comprises three negative meniscus lenses consecutively arranged in order from a position closest to the object side to the image side, and wherein the following conditional expressions are satisfied: where when a lens located closest to the object side of the first lens unit and having an aspheric surface with a positive aspheric amount is defined as a first aspheric lens and a lens located on the image side of the first aspheric lens and having an aspheric surface with a negative aspheric amount is defined as a second aspheric lens, R1 denotes, in a case that a lens surface on the object side of the first aspheric lens is a spherical shape, a radius of curvature of the lens surface and in a case that a lens surface on the object side of the first aspheric lens is an aspheric shape, a radius of curvature of a radius of a reference spherical surface D12 denotes an interval along an optical axis from an object-side lens surface of the first aspheric lens to an object-side lens surface of the second aspheric lens, and BLD1 denotes the length of the first lens unit.