| 摘要 |
PURPOSE:To shorten the time lag until a shutter is released actually after a shutter release operation by extending relatively a pulse time of a driving pulse, and executing read-in of a position sensor in a final step of an inversion area of the position sensor. CONSTITUTION:The device is provided with a step-motor for rotating in accordance with a pulse to be supplied, driving members 4, 5 which are driven from an initial position by the step-motor, and also, reach an effective operating area after running by several steps from the own initial position, and position sensors 18, 20 and 21 in which two states of ON and OFF are inverted by using the inside of an area until the driving members 4, 5 reach the effective operating area from the initial position as an inversion area, and by outputs of the position sensors 18, 20 and 21, the initial positions of the driving members 4, 5 are detected. In this case, a pulse time of a final stage in the inversion area is extended relatively, and also, the outputs of the position sensors 18, 20 and 21 are read in the pulse time of the final stage. In such a way, while securing enough the inversion area, the time lag until an actual shutter operation from a shutter release operation can be shortened, and a malfunction can be prevented. |
