Patent ID: 8317416

Claim:
A barrier device for a camera, comprising: first and second blade members adapted to be pivotable between closed positions to cover a lens surface and open positions to expose the lens surface; a drive member having an engagement portion disposed pivotable with respect to the first and second blade members; a first urging member having one end thereof engaged with the engagement portion and the other end thereof engaged with said the first blade member; a second urging member having one end thereof engaged with the engagement portion and the other end thereof engaged with the second blade member; a third urging member adapted to apply a rotating force to said drive member in opening directions of the first blade member and the second blade member, wherein the first blade member is urged by the first urging member in a closing direction of the first blade member, the second blade member is urged by the second urging member in a closing direction of the second blade member, the urging force of the third urging member with respect to the opening direction is larger than the combined urging force by the first urging member and the second urging member with respect to the closing direction, the engagement portion is movably driven in the opening direction when the first blade member and the second blade member are pivotably moved in the opening directions, and the engagement portion is movably driven in the closing direction when the first blade member and the second blade member are pivotably moved in the closing directions.