| 摘要 |
PURPOSE:To perform multistage control over the quantity of exposure at low cost by providing a moving means which determines a shutter opening time according to a stop position and a position setting means which sets the position where the moving means is stopped. CONSTITUTION:A pulse signal is generated by a contact piece 24 fitted to the lower part of a set lever 20 in the process of the movement of the set lever 20 shown by an arrow A and this pulse signal is detected by a pulse detecting circuit 54 and outputted successively to a coincidence detecting circuit 55, which compares it with a digital signal from a counter 53. Then, when the coincidence detecting circuit 55 detects their coincidence, a coincidence signal E is outputted to a sequence control circuit 50 and a motor 1 is powered on reversely to stop abruptly. Therefore, it is considered that the set lever 20 is moved to the 2nd position based upon light measurement information obtained by a light measuring circuit 51. |
