Capacitive rotary position encoder

Details Capacitive rotary position encoder Capacitive rotary position encoder

1996-09-16

1998-04-07

Oda, Christine K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324683, G01R 2726

Patent

active

057368651

ABSTRACT:
A circuit board has an arcuate array of conductor segments each subject to a digital waveform differing in phase for the various segments, and a concentric pickup conductor. A rotary encoder disk has a conductive pattern which sums and couples the waveforms from selected segments, depending on rotary position, to the pickup conductor. A synchronous phase detector generates a phase signal from the summed waveforms and the zero crossing of the phase signal is detected. A counter develops count signals used to generate the digital waveforms. The count signals are input to a latch which is clocked at the zero crossing point to latch the count value which is a digital measure of the encoder angle.

REFERENCES:
patent: 4788546 (1988-11-01), Sasaki
patent: 4842387 (1989-06-01), Arai
patent: 4879552 (1989-11-01), Arai

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