Patent ID: 6075655
Filing Date: 2000-06-13
Classification: G02B

Abstract:
A zoom lens barrel, comprising:a zoom driving system comprising a focus driving system, the focus driving system comprising a first lens group, said zoom driving system further comprising a second lens group;a first transmission mechanism for transmitting a driving force from an outside driving source to the focus driving system; anda second transmission mechanism, which allows a predetermined play between the zoom driving system and the first transmission mechanism, for transmitting the driving force of the first transmission mechanism to the second lens group when the play is absorbed between the first transmission mechanism and the zoom driving system,wherein the focus driving system as a whole and the second lens group move relative to each other for a zooming operation,wherein only the focus driving system is driven by the driving force of the first transmission mechanism when the play is not absorbed between the first transmission mechanism and the zoom driving system, so that the first lens group is moved for focusing operation, andwherein the zoom driving system is driven by the driving force of the first transmission mechanism when the play is absorbed between the first transmission mechanism and the zoom driving system, so that the focus driving system as a whole and the second lens group are moved for the zooming operation.