MOVING MECHANISM FOR LENS

摘要

PROBLEM TO BE SOLVED: To decrease the number of cam grooves, to facilitate the manufacture of a cam barrel and to reduce the size of the cam barrel by communicating the terminals of the first cam grooves for a first moving lens frame and the beginning ends of the second cam grooves for a second moving lens with each other and forming the first cam grooves and the second cam grooves out of one piece of the cam groove. SOLUTION: In the cam barrel 16, three pieces of the cam grooves 40 for the first group lens and three pieces of the cam grooves 42 for the second group lens are formed on its front surface. The cam grooves 40 and the cam grooves 42 are formed at intervals of 120 deg. in the circumferential direction of the cam barrel 16. The cam grooves 40 are formed of the cam grooves 40A of a nonlinear shape for executing zooming and the straight grooves 40B for collapsing of the first group lens. The cam grooves 42 are formed of the cam grooves 42A of the nonlinear shape for executing zooming and the straight cam grooves 42B for collapsing of the second group lens. The terminals 40C of the cam grooves 40 and the beginning ends 42C of the cam grooves 42 are communicated with each other and the cam grooves 40 and the cam grooves 42 are formed of one piece of the cam groove.