| 摘要 |
PURPOSE:To put only functions for minimum requirment in opration by dividing the circuit of an automatic exposure camera into the indispensable function and additional functin, and by turning the additional function off when a temperature and/or a power voltage falls down. CONSTITUTION:The 1st circuit 3 is equipped with irreducibly necessary circuits for automatic control over a camera, and the 2nd circuit 4 is equipped with additional circuits which are not always required for the control. When a power switch 2 is turned on, a detecting circuit 5 compares outside temperature and the voltage of a power source 1 with set values respectively to output detection signals. Then, when the temperature and power voltage are higher and the camera is in a normal state, the circuit 4 is operated by the output of the detecting circuit 5, so both the circuits 3 and 4 operate. If either one or both of the temperature and the power voltage are lower the circuit 4 is turned off by the output of the detecting circuit 5, so only the circuit 3 operates. Thus, when the temperature or the power voltage drop, the additional functions are turned off to put only the indispensable function in operation. |
