Patent ID: 8867148

Claim:
A lens barrel comprising: a first-group frame provided with a cam follower; a first cam ring which is provided with a cam slide protrusion and in which a cam groove that slidably engages with the cam follower is formed; a second cam ring so supported by the first cam ring that the first cam ring and the second cam ring are unable to rotate relative to each other around an axis parallel to an optical axis; a rectilinear guide ring so supported by the second cam ring that the second cam ring and the rectilinear guide ring are rotatable relative to each other around the axis parallel to the optical axis and unmovable relative to each other in the optical axis direction, the rectilinear guide ring guiding the first-group frame in the optical axis direction; a rectilinear guide/movable frame that guides the rectilinear guide ring in the optical axis direction; a rectilinear cam ring in which a cam slide groove that slidably engages with the cam slide protrusion is formed and which guides the rectilinear guide/movable frame in the optical axis direction; and a rotary ring so supported by the rectilinear cam ring that the rectilinear cam ring and the rotary ring are rotatable relative to each other around the axis parallel to the optical axis and unmovable relative to each other in the optical axis direction.