| 摘要 |
<p>PURPOSE:To preferentially improve the sensor of use while a power source from the outside is being supplied by driving a means for turning on the power source to a circuit part only when required and cutting it off after a prescribed time has elapsed by a built-in battery and inhibiting this means when the power supply from the outside has been executed. CONSTITUTION:A switch 11 executes turn-on turn-off of a supply of a power source of a circuit constituting part 9 by a command from a control circuit 8. For instance, in case there is no access within a prescribed time, the control circuit 8 generates a command of turn-off to the switch 11, turns off a backlight, decreases power of an apparatus and contrives an extension of a battery service life. The next turn-on the power source is executed at the time point when an access has been executed and the switch is turned on by a turn-off signal and the circuit constituting part 9 is driven. Subsequently, in case an external power source has been supplied to a terminal, the control circuit 8 recognizes a supply by a signal light 12, and a disconnection control to the switch 11 is relinquished, that is, it is always set to turn-on. In such a way, while the power source from the outside is being offered, the sense of use can be improved preferentially.</p> |
