Patent ID: 7974012
Filing Date: 2011-07-05
Classification: G02B,Y10T

Abstract:
1. A zoom lens system comprising a front lens group and a rear lens group arranged along an optical axis and in order from an object side, wherein the rear lens group comprises: a first lens unit having a positive refracting power; a second lens unit having a negative refracting power; and a third lens unit having a positive refracting power, wherein upon zooming from a wide-angle end state to a telephoto end state, a space between the front lens group and the first lens unit varies, a space between the first lens unit and the second lens unit increases from d12w to d12t, and a space between the second lens unit and the third lens unit decreases from d23w to d23t, wherein at least a part of the second lens unit is movable so as to have a component in a direction perpendicular to the optical axis, the zoom lens system satisfying conditions of the following expressions: where Bfw is a distance from a lens surface nearest to an image side to an image plane in the wide-angle end state.