| 摘要 |
PURPOSE:To prevent improper exposure control due to information within a transition duration when a photometric output is inputted to a storage circuit, by inhibiting the release operation for a prescribed time from the time point of switching of photomertic systems. CONSTITUTION:If a switch SW6 is turned on when the switch SW6 is turned off and an analog switch AS2 is turned on and an averaged light is measured by a photodetector SPC2, switches AS2 and AS1 are turned off and on respectively, and the partial photmetric output due to a photodetector SPC1 is inputted to an OP amplifier OP2 to output a voltage corresponding to shutter seconds. This output voltage is subjected to A-D conversion by a successive comparison type A-D converter (CP1, CN1, R4-R6, and OP3). Meanwhile, a turnon signal of the switch SW2 due to release is stopped in an NOR gate NR5 by the delay operation of a shift register SF1 for a time required for A-D conversion after turning- on of the switch SW6, and a shutter front curtain does not run. |
