Capacitive touch control and display

H - Electricity – 01 – G

Patent

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Details

340/124.2, 340/1

H01G 5/24 (1980.01)

Patent

CA 1118866

RD-10740 CAPACITIVE TOUCH CONTROL AND DISPLAY Abstract of the Disclosure A control for use upon a solid panel, devoid of control shaft apertures, allows data entry by rotational positioning of a sector-shaped electrode to vary the capacitance to at least one of a plurality of sector shaped electrodes formed about a central disc upon an interior surface of the panel. A magnetizable disk is attached to the exterior of the panel, with the control knob having a magnetized member attracted to the disk for main- taining the control knob in proper position while allowing control knob rotational adjustments. Position-decoding electronics energize successive ones of the plurality of electrodes with successive phases of a master signal and recover zero-crossing information relating the phase of the signal returned from the control to the control position. A light-emitting display is positioned behind the panel to indicate the index of the control knob by a variable length circular bar of light, a digitized display and the like.

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