Capacitive encoder having multiple precision outputs

Details Capacitive encoder having multiple precision outputs Capacitive encoder having multiple precision outputs

1986-11-10

1988-01-19

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 34087037, 318662, H03M 130

Patent

active

047206985

ABSTRACT:
A capacitive position encoder which provides a digital output indication of the relative position between two plates. One of the plates includes first and second conductive input areas which are separated by a gap having the shape corresponding to a square wave. The second plate includes a number of rectangular output pads whose length is equal to one-half of the wavelength of the square wave. The pads are separated from one another by an integral fraction of the wavelength. Periodic input signals which are the inverse of one another are applied to the input areas and are capacitively coupled to the output pads. When the degree of overlap between an output pad and the input areas is equal, a null signal will be generated. Each pad will provide a null signal corresponding to a different position of the plates.

REFERENCES:
patent: 3068457 (1962-12-01), Nevius
patent: 3219920 (1965-11-01), Wall
patent: 3312892 (1967-04-01), Parnes
patent: 3599004 (1971-08-01), Grendelmeier
patent: 3702467 (1972-11-01), Melnyk
patent: 3784897 (1974-01-01), Norrie
patent: 3938113 (1976-02-01), Dobson et al.
patent: 3961318 (1976-06-01), Farrand et al.
patent: 4040041 (1977-08-01), Fletcher et al.
patent: 4507647 (1985-03-01), Minami et al.
patent: 4631524 (1986-12-01), Brooke et al.

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