Blade type focal plane shutter

摘要

A blade type focal plane shutter wherein an auxiliary arm is always biased with a spring so that backlashes at pivotably connecting points between a driving arm and shutter blades and between the auxiliary arm and shutter blades may not have a bad influence on the shutter opening and closing motions. This focal plane shutter is provided with a braking lever which can catch a closing driving lever to prevent a bound from being caused when the motion of the shutter blades for exposure ends.