| 摘要 |
PURPOSE:To prevent unnecessary power consumption by stopping power supply to a photometric circuit when exposure information is stored with an exposure lock operation. CONSTITUTION:If an exposure lock switch SW4 is turned on when a switch SW1 is turned on, the output of a NAND gate 24 is inverted to a low-level storage command signal. An AND gate 29 is closed by the storage command signal to inhibit the clock input to an up/down counter 30, and shutter second information at this time is stored in the counter 30. Simultaneously, the storage command signal is inputted to an inverter 12 and is inverted to a high-level signal, and a transistor 4 is turned off to cut off power supply to a photometric circuit C3. If the SW1 is turned on after the SW4 is turned on, a counter 20 outputs a high- level signal after a certain time to invert the output of the gate 24 to the low- level storage command signal, and power supply to the circuit C3 is cut off. |
