LENS BARREL

摘要

A lens barrel has a rotary frame, lens group frame, and shutter frame. The rotary frame has first and second cam grooves respectively on inner and outer peripheries as viewed in a radial direction. A first cam follower of the lens group frame and a second cam follower of the shutter frame are respectively engaged with the first and second grooves. A radial direction size the rotary frame is smaller than a sum of depths of the first and second grooves. The rotary frame includes a first region W1 only with the first groove, a region W0 with first and second grooves, and a region W2 only with the second groove. Positions of the first and second followers differ in a circumferential direction. At least one of the first and second followers has a non-contact portion not contacting with a groove wall of the corresponding groove in the region W0.

主权项

1. A lens barrel comprising:
a cam cylinder frame having a first cam groove formed on an inner periphery thereof and a second cam groove formed on an outer periphery thereof so as to intersect with the first cam groove as viewed in a radial direction; a first movable frame arranged on an inner peripheral side of the cam cylinder frame and having a first cam follower which is engaged with the first cam groove; and a second movable frame arranged on an outer peripheral side of the cam cylinder frame and having a second cam follower which is engaged with the second cam groove, wherein a size in the radial direction of the cam cylinder frame is set smaller than a sum of a depth of the first cam groove and a depth of the second cam groove so that the cam cylinder frame includes a first region where only the first cam groove is formed, an overlapping region where the first cam groove and the second cam groove are formed, and a second region where only the second groove is formed, the regions being arranged in this sequence in a thickness direction from the inner peripheral side, and wherein a position of the first cam follower and a position of the second cam follower are different from each other in a circumferential direction.