| 摘要 |
PURPOSE:To prevent an abnormal operation of a device, by displaying the consumption state with distiction between the state requiring care and the unusable state and by disconnecting a load circuit and a battery in case of the unusable state. CONSTITUTION:If battery E is normal, the base voltage of transistor Q1 is a voltage sufficient for turning on Q1 even if switch S is turned on, and Q2 is turned off. LED1 is not lit. Q3 is turned on and Q4 is turned off, and LED2 is not lit also. Further, Q5 is turned off, and Q5 is turned on, and Q7 is turned on, and the current is supplied to the circuit of the camera normally. When E is consumed, Q1 is turned off first, and LED1 is lit, and the state requiring care is displayed. When E is consumed furthermore, Q3 is turned off, and LED2 is lit; however, since the circuit from R6 to D1 is turned on, Q2 is turned off, and LED1 is extinguished. Under this state, Q7 is turned off due to turning-on of Q5, and the current to the circuit of the camera is cut off, thereby avoiding the abnormal operation. |
