Abstract A focal plane shutter and shutter blade operating devices for a camera. The focal plane shutter has a plurality of shutter blades arranged in two separate groups operated independently of each other as a shutter-opening blade group and a shutter-closing blade group. A shutter blade operating mechanism comprises a pair of separate devices for opening and closing the shutter with the two groups independently of each other driven in the same direction. Each shutter blade-operating device has a slit-forming or aperture-forming shutter blade in each group driven separately from the other shutter blades of the groups. A main shutter blade-driving lever and an auxiliary parallel lever are both pivotally connected to each slit-forming shutter blade in each group of shutter blades. These two levers in each group of shutter blades are connected to the slit-forming blades with pivots in a common plane and with these pivots on the blade spaced equally from the respective centers of rotation of the parallel levers. The parallel levers function in a parallel arrangement to maintain aperture-forming straight edges travelling across the exposure aperture of the shutter uniformly.
In a focal pLane shutter for a camera having means defining a shutter aperture, a shutter-opening group of shutter blades and a shutter-closing group of shutter blades, mechanism for operating the two groups of shutter blades independently of each other for opening and closing the shutter aperture, the improvement comprising two pairs of parallel levers in said mechanism each mounting a single, slit-forming shutter blade of a corresponding one of said groups of shutter blades for forming a uniformly formed aperture when the shutter aperture is opened and closed, means for pivotally mounting the remainder of shutter blades of each group of shutter blades for movement independently of the corresponding slit-forming shutter blade, and one of said parallel levers of each pair of levers having operating means for actuating said remainder of shutter blades of a corresponding one of said group of shutter blades, and means for actuating said pairs of levers independently in timed sequence.
Claim 2
Dependent Claim
156 words
In a focal pLane shutter for a camera having means defining a shutter aperture, a shutter-opening group of shutter blades and a shutter-closing group of shutter blades, mechanism for operating the two groups of shutter blades independently of each other for opening and closing the shutter aperture, the improvement comprising two pairs of parallel levers in said mechanism each mounting a single, slit-forming shutter blade of a corresponding one of said groups of shutter blades for forming a uniformly formed aperture when the shutter aperture is opened and closed, means for pivotally mounting the remainder of shutter blades of each group of shutter blades for movement independently of the corresponding slit-forming shutter blade, and one of said parallel levers of each pair of levers having operating means for actuating said remainder of shutter blades of a corresponding one of said group of shutter blades, and means for actuating said pairs of levers independently in timed sequence.
Claim 3
Dependent Claim
47 words
In a focal plane shutter for a camera according to claim 1, in which each of the shutter blades of the remainder of shutter blades of each group of shutter blades has an elongated slot, and said operating means comprises a pin received in said elongated slots.