Patent ID: 6657795
Filing Date: 2003-12-02
Classification: G02B

Abstract:
A zoom lens device comprising:a zoom optical system, having at least first and second lens groups, for being set at one focal length between a wide-angle end where a focal length is short and a telephoto end where said focal length is long; a lens barrel for moving in first and second regions to move said first and second lens groups along an optical axis, said lens barrel, when in said first region, focusing said zoom optical system with a predetermined focal length kept by maintaining an interval between said first and second lens groups, and when in said second region, changing said focal length of said zoom optical system; and a first lens moving mechanism for focusing, which changes a focus of the zoom lens device by moving said first lens group relative to said second lens group along said optical axis when said lens barrel is in said second region, wherein the first lens moving mechanism is operable only when the lens barrel is in the second region.