Patent ID: 6819502
Filing Date: 2004-11-16
Classification: G02B

Abstract:
A zoom lens barrel comprising:a cam ring which is driven to rotate; a first lens frame which is positioned around said cam ring to be guided linearly along an optical axis, said first lens frame supporting a frontmost lens group of a zoom lens system; a light-shield exterior ring which is positioned around said first lens frame; a first outer cam groove and a second outer cam groove which are formed on an outer peripheral surface of said cam ring, each said first and second cam grooves including a zooming range for performing a zooming operation of said zoom lens system; and a first cam follower formed on said first lens frame, said first cam follower being engaged in said first outer cam groove; a second cam follower formed on said light-shield exterior ring, said second cam follower being engaged in said second outer cam groove through a linear guide slot which is elongated in a direction parallel to said optical axis, which is formed on said first lens frame, and wherein said first outer cam groove and said second outer cam groove are shaped so as to move said first lens frame and said light-shield exterior ring in the same moving path in said zooming ranges thereof.