Patent ID: 7422381
Filing Date: 2008-09-09
Classification: G03B

Abstract:
1. A shutter apparatus comprising: a shutter substrate having a shutter opening; two shutter blades that are pivotally provided in the shutter substrate and that have cam openings; and an operation member that is engaged with the cam openings and that drives to turn said two shutter blades, wherein: said two shutter blades move to form three states of a fully open state, a fully closed state, and a small aperture state in this order, in accordance with a movement of the operation member; said two shutter blades are positioned to interpose the shutter opening therebetween in the fully open state; a first shutter blade has an aperture opening that forms the small aperture state when said first shutter blade is positioned on the shutter opening, and moves to the shutter opening in one direction while the state is shifted sequentially from the fully open state, to the fully closed state, and to the small aperture state; and a second shutter blade is reciprocated in the fully closed state that serves as a turning point.