| 摘要 |
PURPOSE:To perform accurate automatic determination of aperture by resetting a stopping member perfectly to its initial position as an actuating member presses a movable member in the reset position of the actuating member by the control member provided between the stopping member and the movable member spring connected to this. CONSTITUTION:The continued depression of a shutter button causes a sliding shaft to move and a lever 37 to turn counterclockwise. This also causes the levers 33, 36, spring 38 assuming a loop form moving body with the aperture presetting member 7 to which the aperture cooperating pin 6 of an interchangeable lens makes contact to turn counterclockwise while being controlled of the speed. At this time, a sector gear 27 is turned counterclockwise by the pawl part 33a of the level 33, by which a ratchet gear 30 is turned clockwise by way of a pinion 32. At the same time, a lever 23 turns counterclockwise and tries to turn a stop lever 22 counterclockwise with its eccentric pin 23a, but this turning is blocked because an armature 21 is held attracted to an electromagnet 20. The eccentric pin 23a acts as a control member to control the variations of the stroke of the lever 33 owing to working errors and mounting errors of parts. |
