| 摘要 |
PURPOSE:To obtain the stable and satisfactory measuring accuracy by varying the output state of a digital signal from a digital circuit in a period in which a sensor output signal is not inputted to an analog input circuit from a displacement detector. CONSTITUTION:When driving signals R, S and T of three phases are supplied to a supply electrode 13 of a capacitance type sensor 1, when a slider 12 is stopping, a sensor output signal is outputted from a receiving electrode 15, and when the slider 12 is moved, a phase of the sensor output signal is also varied. This signal is inputted to a switched capacitor type signal detecting circuit 2. When a phase signal is outputted from this circuit 2, a digital signal processing circuit 3 calculates displacement from the phase signal and outputs it to an LCD5. In this case, a timing adjusting circuit 4 executes a timing adjustment so that a variation point of a driving pulse of the LCD 5 conforms with a non-sampling period. Also, driving pulses of a peripheral circuit 7 and a key matrix 6 from the circuit 3 are subjected to timing adjustment by the circuit 4, and only in a non-sampling period, the output state of a digital signal is varied. |
