Lens barrel and image pickup apparatus

摘要

An image pickup apparatus enabling construction of a small bending optical system with high magnification. A first lens group is movably disposed toward an object on a first optical axis. A second lens group is movably disposed radially inward of the first lens group. The second lens group comprises a drive frame drivingly controlled along the first optical axis and a lens holding frame for holding the second lens group. A prism is disposed on the first optical axis, for bending light incident on the prism to thereby guide the light along a second optical axis. The prism is retracted along the second optical axis in a non-shooting state. In the non-shooting state, the second lens group is retracted and accommodated in a space defined by the drive frame and the lens holding frame and a space occupied by the prism in a shooting state.

主权项

1. A lens barrel including a first lens group for taking in light rays incident thereon from an object side along a first optical axis, a barrel section coaxial with the first optical axis and supporting the first lens group, and a reflective section for bending the light rays emitted from the first lens group to thereby guide the light rays along a second optical axis intersecting the first optical axis, the barrel section extending toward the object side along the first optical axis or retracting toward an opposite side from the object side whereby the first lens group is moved along the first optical axis,
wherein the barrel section comprises: a fixed barrel formed with a first cam portion inclined with respect to a circumferential direction, and a second cam portion continuous with an object-side end of the first cam portion, and a movable barrel provided with a cam engaging part for slidable engagement with the first cam portion and the second cam portion, and wherein the reflective section is configured to be moved along the second optical axis between a standby position and a shooting position when the cam engaging part of the movable barrel is in engagement with the second cam portion of the fixed barrel.