Patent ID: 9400374
Filing Date: 2016-07-26
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 positive refractive power, which does not move for zooming; a second lens unit having a negative refractive power, which moves during zooming; a third lens unit having a positive refractive power, which moves during zooming; at least one lens unit having a positive refractive power, which moves during zooming; and a last lens unit having a positive refractive power, which does not move for zooming, wherein, when a focal length fm at an intermediate zoom position is expressed by fm=fw×(Z) where L2W represents an interval between the second lens unit and the third lens unit at the wide angle end, L2fm represents an interval between the second lens unit and the third lens unit at a zoom position at which an offaxial principal ray having a largest image height is farthest from an optical axis on a lens surface disposed on a most object side in the first lens unit in a zoom range from the wide angle end to the focal length fm, f1 represents a focal length of the first lens unit, f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, and f23W represents a combined focal length of the second lens unit and the third lens unit at the wide angle end.