| 摘要 |
A focal plane shutter comprising a front blade operating arm, a front blade driving arm, a single front blade driving spring stretched between both of these arms, a rear blade operating arm, a rear blade driving arm and a single rear blade driving spring stretched between both of these arms, not only the front blade group but also the rear blade group being moved to an exposure aperture covering position after the end of an exposing operation to simplify the structure of a blade actuating device. Both of these driving springs are so arranged as to be able to make the driving force acting on the driving arm stronger than on the operating arm.
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