Patent ID: 7441966
Filing Date: 2008-10-28
Classification: G03B

Abstract:
1. A shutter for an optical apparatus, the shutter having multiple sectors and an operation member, wherein: each of the multiple sectors has a cam opening for engagement and is pivotally provided to open and close a shutter opening; the operation member moves each of said multiple sectors in engagement with the cam opening; the cam opening of at least one sector that is one of the multiple sectors is formed to change a moving direction of said at least one sector, when the operation member moves said at least one sector to a position to close the shutter opening; said multiple sectors move to form a fully open state, a fully closed state, a small aperture state in this order, while the operation member is moving in one direction, the sectors including shutter blades and a small aperture blade; the shutter blades are respectively positioned on identical sides with respect to the position of the shutter opening in the fully open state and the small aperture state; the small aperture blade moves from the fully open state to the fully closed state to the small aperture state in a single direction; and the shutter blade is reciprocated in the fully closed state that serves as a turning point.