| 摘要 |
In a single lens reflex photographic camera including a shutter release and a diaphragm, a mirror is movable between a first position for view finding and a second position for film exposure. The mirror is placed in the second position and the diaphragm is stopped down responsive to the shutter release. Prior to exposure, the diaphragm stop down mechanism is locked. After exposure, a shutter completion mechanism is actuated. Responsive to the actuation of the shutter completion mechanism, the diaphragm stop down mechanism is unlocked and the mirror is placed in the first position. A reduction in complexity results because both resetting operations are executed responsive to the same element, namely the shutter completion mechanism. An actuating pin operates twice during each camera cycle-once at the time of resetting the mirror and once at the time of shutter charging. A control magnet has an armature and a core. The diaphragm is locked responsive to the repulsion of the armature from the core and unlocked responsive to the attraction of the armature against the core. The armature is driven against the core responsive to the operation of the actuating pin, thereby unlocking the diaphragm stop down mechanism and insuring that the armature is not separated from the core prior to a subsequent shutter release.
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