| 摘要 |
PURPOSE:To stabilize always the shutter aperture, by providing an elastic member or the like, which gives elasticity to a driving shaft, in long holes which are fitted to the driving shaft to turn shutter blades. CONSTITUTION:When an opening lever 2 starts operating, a driving shaft 3 and long holes 4 and 4' of blades are fitted to each other, and blades 1 and 1' start rotating around turning center shafts fitted to holes 5 and 5', and shutter blades 1 and 1' are moved in opposite directions to make a shutter aperture. When long holes 4 and 4' of blades are constituted so as to have a width (a) a slightly narrower than the diameter of a driving pin 3, the driving shaft 3 is pressed by the elasticity of their projecting parts to eliminate the play between blade long holes 4 and 4' and the driving shaft 3. Consequently, the shutter aperture is always stabilized because blades 1 and 1' are turned as one body in accordance with the motion of the driving shaft 3 to minimize the variance of the aperture due to fitting error. |
