| 摘要 |
PURPOSE:To obtain the titled device which always takes photograph under correct exposures, by detecting the distance of the object to be photographed when photograph is taken with flash, and changing the photographing mode automatically from the flashing mode to the daylight mode when said distance is out of the interlocking range which guarantees a correct exposure. CONSTITUTION:When the distance of the object to be photographed is 1m, the charged potential of a capacitor 50 becomes higher than the electric potential at the input terminal of a comparator 153, and all comparators 153 and 73-75 output an HL and all latch circuits 151 and 85-87 hold an HL and output the HL. The charged voltage of a capacitor 57 is AD-converted and a signal corresponding to the distance of the object to be photographed is latched in the latch circuits, and, at the same time, AND gates 150 and 82-84 are closed, information input to the latch circuits are inhibited, and the latch circuits maintain the output condition until the output of a comparator 51 becomes an LL, after one shot pulse width time has passed. After one shot pulse width time, a transistor 68 is turned on and the charged charge of the capacitor 57 is reset, and thus the photographing mode is switched to the daylight mode. In this way a correct exposure can be maintained always. |
