Patent ID: 7380999
Filing Date: 2008-06-03
Classification: G03B

Abstract:
1. A shutter device, comprising: a first light shielding plate and a second light shielding plate which are formed to open and close an opening; a first driving member which includes a first armature, and is connected to said first light shielding plate to give an urging force to the first light shielding plate in a direction to open the opening; a first electromagnetic device which makes said first light shielding plate in a first position capable of running in the direction to open the opening by being switched to a non-energized state from an energized state in which it holds said first light shielding plate in the first position by suction-holding the first armature; a second driving member which includes a second armature, and is connected to said second light shielding plate and gives an urging force to the second light shielding plate in a direction to close the opening; a second electromagnetic device for the second light shielding plate which makes said second light shielding plate in a second position capable of running in the direction to close the opening by being switched to a non-energized state from an energized state in which it holds said second light shielding plate in the second position by suction-holding the second armature; and a locking member displaceable to a locking position to inhibit an operation of said second light shielding plate of running in the direction to close the opening, and an unlocking position to allow an operation of said second light shielding plate of running in the direction to close the opening, wherein said locking member displaces to the locking position by the first light shielding plate running in the direction to open the opening, and displaces to the unlocking position by said first electromagnetic device being switched to the energized state from the non-energized state before said second light shielding plate starts running in the direction to close the opening.