Patent ID: 6809884
Filing Date: 2004-10-26
Classification: G02B

Abstract:
A zoom lens barrel assembly having an optical axis comprising:a first lens group including a first sub-lens group and a second sub-lens group which move integrally during zooming; a second lens group, the first and the second lens groups moving relative to each other along the optical axis during zooming; a sub-lens group switching mechanism for moving one of said first and said second sub-lens groups away from the other of said first and second sub-lens groups in a short focal length photographing range and toward said other of said first and second sub-lens groups in a long focal length photographing range; and a zoom cam mechanism having a front lens group cam groove and a rear lens group cam groove for moving the first lens group and the second lens group toward and away from each other during zooming; wherein the rear lens group cam groove includes a first portion corresponding to the short focal length photographing range and a second portion corresponding to the long focal length photographing range, the first and the second portions connected to each other via a discontinuous portion; and wherein the front lens group cam groove includes a non-linear portion which corresponds to the short focal length photographing range and provides a non-linear path, and a linear portion which corresponds to the long focal length photographing range and provides a linear path.