Patent ID: 6046865
Filing Date: 2000-04-04
Classification: G02B

Abstract:
A zoom lens barrel comprising:a zoom ring supported by a fixed barrel so as to be freely rotative, the zoom ring being driven rotatively at the time of zooming;a zoom cam barrel disposed inside said zoom ring, the zoom cam barrel serving to move an optical lens group forward and backward in a direction of an optical axis;a first connecting portion for connecting said zoom ring and said zoom cam barrel;a straightly moving ring which is restrained from rotating by a restraint portion formed in said fixed barrel and moves forward or backward along with said zoom cam barrel;a driving ring which is supported by said fixed barrel so as to be freely rotative and driven rotatively at the time of focussing;a focus ring which holds an optical lens group composed of at least one optical lens and is fitted to said straightly moving ring by screwing, the focus ring rotating to move forward or backward in the direction of the optical axis; anda second connection portion which connects said focus ring and said driving ring rotatable together but movable in the direction of the optical axis relative to each,wherein in at least one spot of said zoom lens barrel, said first connecting portion, said restraint portion and said second connecting portion are disposed on the same section plane perpendicular to the optical axis.