Patent ID: 8947798
Filing Date: 2015-02-03
Classification: G02B,G03B

Abstract:
1. A lens cap unit which is mounted on a lens barrel including a fixed cylinder and a movable lens cylinder which is provided in the fixed cylinder and is extendable from and collapsible in the fixed cylinder in a direction of optical axis, the lens cap unit comprising: a mounting part mounted on the fixed cylinder; at least one barrier provided on the mounting part to be movable between a closed position covering a leading end portion of the movable lens cylinder and an opened position opening the leading end portion of the movable lens cylinder; and a cam protrusion provided on the barrier, the barrier being supported on the mounting part to be rotatable about an opening and closing axis perpendicular to the optical axis, the cam protrusion being configured to extend from a surface of the barrier facing the movable lens cylinder and face the leading end portion of the movable lens cylinder, and to be disposed outside an effective diameter of the movable lens cylinder, in a state where the barrier covers a leading end portion of the movable lens cylinder.