| 摘要 |
When a hold member rotates on a shaft counterclockwise in the set operation, pressing parts of a pressing member which is fitted on top end of the hold member press pressed parts of iron piece members to rotate a lock-releasing member for a first blade and a lock-releasing member for a rear blade so that the iron piece members are made to come into contact with iron-core members of electromagnets, while an engagement pin presses an arm of a connection spring to rotate a restraining member clockwise so that a restraining part of the restraining member moves into the trajectory of the movement of a restrained part of the lock-releasing member for the rear blade. When the coils of the electromagnets are not electrified and the hold member rotates clockwise, the lock-releasing member for the front blade presses a front blade locking member to make it possible to perform an open operation of the front blade, while the lock-releasing member for the rear blade cannot press a rear blade locking member because the lock-releasing member for the rear blade is restrained by the restraining member. As a result, an exposure aperture is fully opened, and it becomes possible to perform observation with electronic finder.
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