Patent ID: 8496389

Claim:
A shutter device for use in an imaging apparatus including a mirror that can move back and forth in a photographic optical path, the shutter device comprising: a shutter plate formed with an aperture through which a photographic light flux passes; a shutter blade configured to close and open the aperture; a blade lever configured to rotate, thereby being coupled with the shutter blade; a blade return spring configured to urge the blade lever in a direction in which the shutter blade opens the aperture; a drive lever configured to rotate around a rotation shaft of the blade lever to drive the blade lever; a blade drive spring configured to urge the drive lever; a mirror lever configured to drive the mirror; a mirror lever drive spring configured to urge the mirror lever; a charge member configured to charge the mirror lever drive spring and the blade drive spring, a hold member configured to hold the blade lever so that the shutter blade closes the aperture, wherein in a case when the blade drive spring is charged, the hold member switches whether the hold member holds the blade lever regardless of the drive lever, wherein the charge member and the hold member are coupled with each other directly so that the charge member and the hold member rotate in same speed, wherein in a case when the charge member and the hold member rotate one turn, the shutter device is arranged to change to a first state, a second state, and a third state in this order, wherein in the first state, the charge member is arranged to charge the mirror lever drive spring and the blade drive spring, and the hold member holds the blade lever, wherein in the second state, the charge member is arranged to release charging of the mirror lever drive spring and to charge the blade drive spring, and the hold member releases holding of the blade lever, and wherein in the third state, the charge member is arranged to release charging of the mirror lever drive spring and to release charging of the blade drive spring, and the hold member releases holding of the blade lever.