Cam mechanism of a photographing lens

摘要: A cam mechanism includes a ring, and linearly movable frame supporting an optical element. Cam groove groups are located at different positions in circumferential direction on the each group grooves optical-axis trace same reference diagram. intersects another of adjacent thereto direction. Each follower followers engageable with group. In group, least one complementing remains engaged corresponding when passes through intersection area intersecting during rotation ring.