Patent ID: 6909464
Filing Date: 2005-06-21
Classification: G02B

Abstract:
1. A zoom lens comprising: a plurality of lens groups which are moved with respect to each other to change a focal length of said zoom lens; and a cam barrel having at least one cam groove formed on an inner peripheral surface thereof, wherein at least one of said plurality of lens groups is moved in a direction of an optical axis by rotation of said cam barrel in accordance with a contour of said cam groove; wherein said cam barrel comprises: a first barrel having said cam groove on an inner peripheral surface thereof; and a second barrel which is fitted on a front part of an outer peripheral surface of said first barrel, said first barrel and second barrel being movable in said optical axis direction with a predetermined clearance therebetween in the optical axis direction while being rotatable together about said optical axis, so that an external force applied to said zoom lens from the outside of said zoom lens is transmitted to said first barrel via said second barrel.