Zoom lens barrel assembly for a camera including a rotating barrel capable of selecting one of several zoom positions as well as focusing

摘要

A zoom lens barrel assembly for zooming and focusing of the zoom lens by shifting lenses of a zoom lens along the optical axis which includes a motor driven operating barrel operative to make zooming and focusing of said zoom lens, a first cam barrel with zooming and focusing cams capable of being situated in predetermined zooming positions arranged at regular angular intervals by a positioning mechanism to achieve zooming of the zoom lens, and a second cam barrel capable of rotating together with the motor driven operating barrel and relatively to the first cam barrel through an angular interval corresponding to an integral multiple as long as the regular angular interval to focus the zoom lens while the first barrel is situated in a predetermined zooming position to achieve focusing of the zoom lens. The first and second cam barrel are operationally coupled together so as to turn as one whole during zooming said zoom lens.