Patent ID: 8854504
Filing Date: 2014-10-07
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising: a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, in an order from an object side to an image side; and an aperture stop disposed between a lens surface closest to the image side of the second lens unit and a lens surface closest to the object side of the fourth lens unit, wherein an interval of each lens unit is configured to be changed in zooming, wherein the first lens unit, in order from the object side to the image side, consists of one or two negative lenses and one positive lens, wherein the second lens unit consists of one lens component that moves to the image side in focusing on an object at an infinite distance to a short distance object, and wherein following conditional expressions are satisfied: where D23w is an interval between the second lens unit and the third lens unit when focusing on the object at an infinite distance at a wide angle end, f23w is a combined focal length of the second lens unit and the third lens unit when focusing on the object at an infinite distance at the wide angle end, f4Rw is a combined focal length of each lens unit at the image side relative to the third lens unit when focusing on the object at an infinite distance at the wide angle end, and D2 is a length on an optical axis from a lens surface closest to the object side of the second lens unit to the lens surface closest to the image side of the second lens unit.