Lens shifting mechanism

摘要

A photographic camera with a zoom lens comprises a fixed lens barrel and a movable lens barrel which has a fixed lens group and a movable unit movably receiving a lens group. The movable unit is adapted to rotate in the movable lens barrel so as to shift axially the movable lens group with respect to the fixed lens group when the movable lens barrel is axially moved in order to shift the zoom lens between a wide-angle and a telephotographic condition. The lenses of the lens group of the movable unit are held by lens holders that are a round-ended configuration with straight sides between the rounded ends. These straight sides leave part-circular spaces in the movable unit, which is in the form of a rotatable cylinder. Rods on which these lens holders are slidably mounted are disposed in these part-circular spaces, to achieve a compact configuration.