Patent ID: 8511917
Filing Date: 2013-08-20
Classification: G03B

Abstract:
1. A shutter device comprising: a shutter base plate having an aperture; a shutter blade configured to close and open the aperture; a blade lever connected with the shutter blade and configured to pivot about a pivot axis in relation to the shutter base plate; a blade return spring configured to urge the blade lever in a direction of opening the aperture by the shutter blade; a drive lever configured to pivot in relation to the shutter base plate around the pivot axis of the blade lever and to press the blade lever in a direction of closing the aperture by the shutter blade; a roller that is rotatably supported around a shaft provided to the drive lever; a blade drive spring configured to urge the drive lever in the direction of closing the aperture by the shutter blade; a first member configured to lock the blade lever to cause the shutter blade to shift to a state of closing the aperture; and a second member configured to charge the blade drive spring by moving the drive lever, wherein, when the blade lever is driven in the direction of opening the aperture by the shutter blade with an urging force of the blade return spring, the blade lever is configured to move while changing a relative position against the drive lever, wherein, when the blade lever is driven in the direction of closing the aperture by the shutter blade with the urging force of the blade return spring, the drive lever and the blade lever move by a mutually integrated operation, wherein a roller bearing portion is provided to the blade lever to prevent falling off of the roller, the roller bearing portion extends towards the shaft around which the roller is rotatably provided, and wherein the roller bearing portion is provided in a range in which the shaft moves when the blade lever is driven in the direction of opening the aperture by the shutter blade with the urging force of the blade return spring.