Capacitive touch switch array

Details Capacitive touch switch array Capacitive touch switch array

1978-10-30

1980-11-11

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

340365C, H01H 3500

Patent

active

042335221

ABSTRACT:
A capacitive touch panel comprising an array of touch sensitive switch cells, the panel including relatively small area touch switch elements located on closely spaced centers, that can be of transparent construction particularly suited for use with data processing equipment and electronic displays. Each switch cell includes a first and a second pair of series connected capacitors energized by a common signal source, the array of switch cells being arranged so that the first pair of capacitors are connected in first groups of switch cells, such as rows, to a corresponding first plurality of signal detectors, and the second pair of capacitors are connected in second groups of switch cells, such as columns, to a corresponding second plurality of signal detectors, the junctions of each pair of capacitors of a single switch cell being selectively coupled to ground by the body or other touch capacitive means for actuating a selected switch cell.

REFERENCES:
patent: 3382588 (1968-05-01), Serrell et al.
patent: 3492440 (1970-01-01), Cerbone et al.
patent: 3691555 (1972-09-01), Looschen
patent: 3886539 (1975-05-01), Gould, Jr.
patent: 3921167 (1975-11-01), Fox
American Microsystems Inc., Application Note, "Touch Control Circuits for Capacitance Switching".

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