| 摘要 |
<p>PURPOSE:To prevent the waste of a battery in the unuse state by invalidating the operation of a power switch in the unuse state with a display device closed and supplying power to set the operation state regardless of closing of the display device at the time of automatic power supply start. CONSTITUTION:In the unuse state with a display device 3 closed, FFs 1 to 9 of a power control circuit 10 are reset and outputs Q are all in the low level. Even if a power switch is turned on in this state, the reset output Q of the FF 8 is in the low level because the output of a gate circuit G4 is in the low level and the FF8 is in the reset state, and the FF 9 is not set, and the control signal to drive a power supply circuit 11 is n the low level and the circuit 11 is not driven. When the automatic start mode is set, a main controller 4 detects this mode to output an automatic power supply start permission signal in the high level to the circuit 10 through a control circuit 9. The output of a gate circuit G1 goes to the high level, and the set output of the FF 1 goes to the high level, and set outputs of FFs 7 and 8 go to the high level, and the power control signal in the high level of an FF 9 is supplied to the circuit 11 to set the operation state.</p> |
