| 摘要 |
PURPOSE:To supply electric power continuously for a specific time even after various operations are comleted at a side supplied with electric power by detecting the end of operations and holding a switch means forcibly on for the specific time after the detection. CONSTITUTION:The output of a one-chip microcomputer 15 is inverted from a high level to a low level after operation, and then a buffer 20 outputs a high- level signal for a specific time determined by a resistance 21 and a capacitor 22, so the output of an OR gate 23 is still the high-level signal and a transistor (TR)24 is still on. Therefore, the TR7 is on for the specific time. Then, the TR7 turns off when a TR24 turns off because a TR9 is still off, so that a data imprinting device 25 is not powered on by a source battery 3 any more. When the TR7 turns off, electric power is supplied from a back battery 16 through a diode 17 to maintain a power-down function state. |
