| 摘要 |
PURPOSE:To save power in the standby state by providing a power supply control section controlling a current consumption by an output of a touch detec tion section to be decreased to the touch circuit so as to supply required power to the touch switch in the standby state and in the operating state. CONSTITUTION:A power is supplied enough to be in operation of a touch detection section 2 and a next stage drive 5 to a touch switch power supply line 10 in the standby state, then the next stage drive 5 gives an output so that a non-touch signal (in this case, at a high level) is fed to a touch detection signal line 12. A TR 13 is turned on and a TR 14 is turned off. In this case, the power is supplied to the power supply line 10 via a resistor 15. When a person touches a touch plate 1, the detection section 2 detects the touch signal to activate a buzzer tone generating section 3 and an LED lighting section 4, the output of the next stage drive 5 is inverted to drive an inverter type lighting section 7 thereby lighting a lamp 8 and the level of the line 12 is also inverted and the TR 13 is turned off. Thus, the TR 14 is turned on and power is supplied to the power supply line 10 through resistors 15, 16. |
