| 摘要 |
PURPOSE:To always achieve stroboscope flashing in synchronization with the time that a light-shielding blade starts running in the close direction and to achieve accurate hilltop flashing by setting or selecting optimum stroboscope flash signal output timing. CONSTITUTION:An electromagnetic actuator 5 starts according to desired exposure quantity information and exposure time information both of which are sent from an exposure control circuit, and a drive pin 26 moves in the normal direction from its rest position. Together with the drive pin 26, an actuation lever 21 also moves to displace in the normal direction along the prescribed locus from its rest position; the blades 19 and 20 are actuated to start exposure; shortly the blades 19 and 20 reach the extremal aperture position. At the end of exposure, the output torque of the actuator 5 is switched to the reverse direction; the drive pin 26 moves in the reverse direction, and the actuation lever 21 also returns to the rest position together with the pin 26; thereby the operation for a camera is completed. As it does so, a synchronous stroboscope device carries out hillside flashing or hilltop flashing. Thus, accurate hilltop flashing can be achieved. |
