Patent ID: 7190520
Filing Date: 2007-03-13
Classification: G02B

Abstract:
1. A zoom lens system comprising: a front lens group including a plurality of lens units, wherein during a zooming operation from a wide angle end to a telephoto end, wherein a space between two adjacent lens units of the plurality of lens units constituting the front lens group changes to facilitate increasing imaging magnification; and a rear lens group with positive optical power including an image stabilizing lens unit and a first lens component, wherein the image stabilizing lens unit has negative optical power and is movable in a direction perpendicular to an optical axis of the system, wherein the first lens component has positive optical power, wherein during zooming operation, a space between the image stabilizing lens unit and the first lens component changes, wherein the front lens group and the rear lens group are disposed from an object side to an image side along the optical axis, respectively, wherein the image stabilizing lens unit and the first lens component are disposed from the object side to the image side along the optical axis, respectively, wherein a focal distance, fis, of the image stabilizing lens unit and a focal distance, ft, of the system at the telephoto end satisfy the following condition: wherein the rear lens group includes a second lens component with positive optical power and being disposed on the object side with respect to the image stabilizing lens unit, wherein during the zooming operation, a space between the second lens component and the image stabilizing lens unit increases, and the space between the image stabilizing lens unit and the first lens component decreases, wherein a focal distance, fRB wherein the front lens group includes a first lens unit having positive optical power and a second lens unit having negative optical power, the first and second lens units being arranged from the object side to the image side, respectively, wherein during the zooming operation, a space between the first lens unit and the second lens unit increases, and a space between the second lens unit and the rear lens group decreases, and wherein a focal distance, f