Patent ID: 8508858

Claim:
A lens barrel comprising: an optical system including a first lens group, a second lens group, and a third lens group sequentially arranged from a subject side; a first frame including a first main body that supports the first lens group and at least one first cam follower formed on the outer peripheral side or inner peripheral side of the first main body and protrudes in the radial direction from the first main body; a second frame including a second main body that supports the second lens group and at least one second cam follower formed on the outer peripheral side or inner peripheral side of the second main body and protrudes in the radial direction from the second main body, the second frame being configured to restrict rotation of the first frame about an optical axis of the optical system; a third frame including a third main body that supports the third lens group and at least one third cam follower arranged on the outer peripheral side or inner peripheral side of the third main body and protrudes in the radial direction from the third main body, the third frame being configured to restrict rotation of the second frame about the optical axis of the optical system; a rectilinear frame configured to restrict rotation of the third frame about the optical axis; and a cam frame including a cam frame body rotatably disposed with respect to the rectilinear frame, at least one first cam groove formed in the cam frame body to guide one of the at least one first cam follower, at least one second cam groove formed in the cam frame body to guide one of the at least one second cam follower, and at least one third cam groove formed in the cam frame body to guide one of the at least one third cam follower.