Patent ID: 8228605
Filing Date: 2012-07-24
Classification: G02B

Abstract:
1. An anti-vibration zoom lens optics adapted to have four groups of lens pieces, a leading, first lens group of positive refractivity, a succeeding, second lens group of negative refractivity, a third lens group of positive refractivity, and a trailing, fourth lens group of positive refractivity all arranged in this order from the front end closest to the object to the rearmost; the fourth lens group including three subsets of lens pieces, comprising a leading, first subset, a succeeding, second subset, and a trailing, third subset all arranged in this order from the front end closest to the object to the rearmost; and the second subset of lens pieces being moved perpendicular to the optical axis to compensate for blur in the imaging plane, wherein the zoom lens optics is designed to meet the requirements given in the following formulae: where f4 is a focal length of the fourth lens group, f42 is the focal length of the second subset of lens pieces in the fourth lens group, and f43 is the focal length of the third subset of lens pieces in the fourth lens group.