Patent ID: 8228615
Filing Date: 2012-07-24
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from an object side to an image side thereof, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, wherein the distance between the adjacent lens units changes when zooming, wherein: the third lens unit includes, in order from the object side to the image side, a first lens subunit having negative refractive power and a second lens subunit having positive refractive power, wherein the zoom lens is configured to displace an image formed by the zoom lens in a direction perpendicular to its optical axis by moving the second lens subunit so as to have a component perpendicular to the optical axis and the following conditions are satisfied: where R 3 a 1 is a curvature radius of a surface, closest to the object, of the first lens subunit, R 3 a 2 is a curvature radius of a surface, second closest to the object, of the first lens subunit, f 3 is a focal length of the third lens unit, and f 3 a is a focal length of the first lens subunit.