Patent ID: 7663802
Filing Date: 2010-02-16
Classification: G02B

Abstract:
1. A zoom lens system with a vibration reduction function comprising, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power, upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, and a distance between the second lens group and the third lens group decreasing, the third lens group comprising, in order from the object, a first lens sub-group having positive refractive power, a second lens sub-group having negative refractive power, and a third lens sub-group, only the second lens sub-group being moved in a direction perpendicular to an optical axis for correcting an image blur on an image plane upon generating a camera shake, and the following conditional expressions being satisfied: where d31 denotes a distance between the first lens sub-group and the second lens sub-group, d32 denotes a distance between the second lens sub-group and the third lens sub-group, f32 denotes a focal length of the second lens sub-group, and f33 denotes a focal length of the third lens sub-group.