Capacitance sensor apparatus of divided multi-electrode type

Details Capacitance sensor apparatus of divided multi-electrode type Capacitance sensor apparatus of divided multi-electrode type

1992-08-31

1994-06-14

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324675, 324690, 34087037, G01R 2726, G08C 1910

Patent

active

053213661

ABSTRACT:
A plurality of sensor circuits each including an oscillator circuit, a detection electrode, and a ceramic resonator for changing a resonance frequency in accordance with a change in small electrostatic capacitance detected by the detector electrode and outputting a detection signal corresponding to a change in resonance frequency are formed on a circuit board. Detector electrode surfaces A.sub.1 to A.sub.4, B.sub.1 to B.sub.4, and C.sub.1 to C.sub.4 of the first to third sensor circuits are formed on the upper surface of the circuit board in a divisional manner. The detection surfaces of the respective sensor circuits are arranged to have codes in the scanning direction of an object to be detected. The fixed capacitances of the detection surfaces are decreased, and a change of state of the object can thus be detected at a high resolution. Since the detection surfaces of the respective sensor circuits are arranged to have codes in the scanning direction, detection data on a wide area can be obtained with a small number of sensor circuits.

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