Patent ID: 6749348
Filing Date: 2004-06-15
Classification: G03B

Abstract:
A focal-plane shutter for a digital still camera comprising:a first base plate having a first aperture for a photography optical path; a second base plate, having a second aperture for a photography optical path which matches said first aperture, for forming a blade room between said first base plate and said second base plate; a plurality of arms mounted on one of said first and second base plates; a shutter blade made up of one or more blades, supported by said plurality of arms, which is reciprocally moved between a first position where said shutter blade is retracted from said photography optical path and a second position where said shutter blade covers said photography optical path in said blade room; a driving member, mounted on said first base plate outside said blade room, which presses one of said arms only at the time of action by the force from a driving spring so that said shutter blade is moved in a first direction; a motor, mounted on said second base plate outside said blade room, which moves said shutter blade in said first direction and in a second direction, through one of said plurality of arms corresponding to reciprocal rotation of the stator of said motor; a set member, mounted on said first base plate outside said blade room, which moves from an initial position so that said driving member is moved to a set position against the force from said driving spring; and holding means which hold said driving member at a set position at least during movement of said set member for returning to said initial position, with the holding force thereof being released during the movement of said shutter blade by the force from said driving spring.