| 摘要 |
PURPOSE:To simplify both the working mechanism and the circuit by fixing the travelling start time of rear shutter blade in a prescribed time from the stop-down starting time point and thus ensure coincidence between the stop-down finish time and the travelling start time of front shutter blade. CONSTITUTION:The hook of a stop-down lever 16 is cancelled with the rise of mirror by release, and thus the lever 16 turns toward (d) by a spring 30. As a result, the diaphragm is stopped down and at the same time a fan-shaped gear 18 is turned. With the turning of the gear 18, a star gear 23 turns via an accelerating mechanism. When a prescribed number of teeth of the gear 23 are detected, an electric conduction is discontinued to a stop-down control magnet 24 and a front shutter blade controlling magnet 10. As a result, the stopping-down is stopped to start the travelling of the front shutter blade. An electric conduction is stopped to a rear shutter blade control magnet 11 after a prescribed time from the stop-down start time. Then the rear shutter blade travels to complete an exposure. |
