Capacitive position sensor including a scale with integral topog

Details Capacitive position sensor including a scale with integral topog Capacitive position sensor including a scale with integral topog

1993-11-16

1995-02-28

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324662, 324688, 324690, G01B 722, G08C 1910

Patent

active

053940962

ABSTRACT:
A capacitive position sensor has a scale (10), having hollow or raised topographical features, and a cursor (20) having an electrode array comprising at least two transmitting electrodes (21a, 21b) and at least one receiving electrode (21c) separated by shielding electrodes (21g). The coupling capacitances (Cac, Cbc) between transmitting and receiving cursor (20) electrodes are modified as a function of the position (x) of the scale topographic feature (11) relative to the cursor, the evaluation of the variation of the signals picked up by the receiving electrode permitting a precise measurement of the relative displacement between scale and cursor.

REFERENCES:
patent: 4449179 (1984-05-01), Meyer
patent: 4543526 (1985-09-01), Burckhardt et al.
patent: 4607213 (1986-08-01), Neukermans et al.
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patent: 4841225 (1989-06-01), Meyer
patent: 4882536 (1989-11-01), Meyer
patent: 4893071 (1990-01-01), Miller
patent: 5068653 (1991-11-01), Klingler et al.
D. R. Dobson et al, "Position Encoder", IBM Technical Disclosure Bulletin, vol, 21, No. 1, Jun. 1978, pp. 242-243.

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