| 摘要 |
PURPOSE:To improve the light shielding property at a low cost by moving a slit forming blade by the engagement of a long hole and a pin being sufficient with the usual accuracy, which can be manufactured easily, as the working accuracy, and also, constituting the slit forming edge of the slit forming blade so that a part being parallel to the edge of an aperture for photographing can be obtained optionally in one or three places. CONSTITUTION:When auxiliary blades 3, 4 rotate, a slit forming blade 2 supported so as to be rotatable by caulking pins 3a, 4a starts to run from the lower part to the upper part, and starts to release the light shielding of the aperture 1a for a photographing. By following this run, an auxiliary blade 8 engaged and supported by the slit forming blade 2 and a caulking pin 8a slides against a shaft 5 by a long groove 8b and starts the rotation and movement. Also, other auxiliary blade group is supported pivotally so as to be turnable against a shaft 9, and fitted to a driving pin 7b with a pin through a cam groove provided on each blade, therefore, rotates counterclockwise by the run of the driving pin 7b. Each auxiliary blade is operated successively by the driving pin 7b and the slit forming blade 2 is run from the lower part to the upper part, and also, the aperture 1a for the photographing is opened.
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