Patent ID: 6101335
Filing Date: 2000-08-08
Classification: G02B

Abstract:
A zoom lens barrel assembly for zooming and focusing a zoom lens comprising a plurality of lens elements, which comprises:an operating barrel formed with a zooming cam and a focusing cam for guiding at least two of said lens elements, said operating barrel being able to turn about said optical axis to shift said at least two lens element along said optical axis through said zooming cam and focusing cam for zooming and focusing the zoom lens;an inner movable barrel fixedly holding at least another one of said lens elements and formed with a focusing cam, said inner movable barrel being coaxially installed in said operating barrel so as to be movable in an axial direction only along said optical axis to shift said another lens element along said optical axis for focusing;an intermediate barrel coaxially installed in said operating barrel so as to be able to turn relatively to said operating barrel and said inner movable barrel about an optical axis of the zoom lens within a specified extent of angular interval; andclutch means for coupling said intermediate barrel to said inner movable barrel together to restrain said intermediate barrel from turning relatively to said inner movable barrel so as thereby to shift said inner movable barrel together with said intermediate barrel along said optical axis through said zooming cam following a turn of said operating barrel during zooming, and uncoupling said intermediate barrel from said inner movable barrel and coupling said intermediate barrel to said operating barrel to restrain said intermediate barrel from turning relatively to said operating barrel and allow said inner movable barrel to turn relative to said intermediate barrel, so as thereby to shift said inner movable barrel relatively to said intermediate barrel and said operating barrel along said optical axis through said focusing cam of said inner movable barrel following a turn of said operating barrel during focusing.