Patent ID: 8596893

Claim:
A shutter device comprising: a shutter base plate which has an aperture; a shutter blade configured to close and open the aperture; a blade lever connected with the shutter blade; a blade return spring configured to urge the blade lever in a direction in which the aperture is opened by the shutter blade; a drive lever configured to press the blade lever in a direction in which the aperture is closed by the shutter blade; a blade drive spring configured to urge the drive lever in a direction in which the aperture is closed by the shutter blade; an armature which is arranged on the drive lever; a yoke configured to attract the armature when energized by an attractive force; a first member configured to hold the blade lever to cause the shutter blade to maintain a state of closing the aperture; and a second member configured to charge the blade drive spring by moving the drive lever, wherein in case when the second member makes the drive lever move to an overcharged position beyond an attraction position where the armature is attracted by the yoke and the second member contacts the drive lever, the blade drive spring is overcharged, wherein in a case when the blade drive spring is overcharged, the blade lever does not contact the drive lever even if the blade lever is driven by an urging force of the blade return spring, and wherein in a case when contact between the second member and the drive lever is released and the drive lever moves to the attraction position from the overcharged position, the blade lever contacts the drive lever before the yoke starts attracting the armature.