Patent ID: 7920336
Filing Date: 2011-04-05
Classification: G02B

Abstract:
1. A barrier mechanism comprising: a barrel configured to hold a lens, wherein the barrel further includes bayonet claws which fit into the flange portions to control a movement of a barrier drive member relative to the barrel in an optical axis direction, and wherein the bayonet claws are formed by providing lateral holes orthogonal to the optical axis in the barrel; barrier blades configured to protect the lens held by the barrel; a barrier drive member configured to rotate to open/close the barrier blades; wherein the barrel includes a through-hole through which an interlocking lever provided on the barrier drive member passes in order to convey a rotation force of the barrier drive member; wherein the barrier drive member includes a flange portion in a circumferential direction, and wherein the flange portion is positioned at the same phase as the interlocking lever and covers the through-hole from an optical axis direction during a rotation of the barrier blades from an open state to a closed state; and a covering member configured to cover the barrel; wherein the covering member covers the lateral holes.