Capacitive touch control and display

Details Capacitive touch control and display Capacitive touch control and display

1979-05-07

1981-04-28

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

178 19, 361280, 361292, 361300, G06F 303

Patent

active

042649030

ABSTRACT:
A control for use upon a solid panel, devoid of control shaft apertures, allows data entry by rotational positioning of a human member, such as one's finger, about a pattern of a plurality of interdigitated electrodes formed upon an interior surface of the panel. The position of the member varies the capacitance between adjacent ones of the electrodes, with position-decoding electronics energizing successive ones of the plurality of electrodes with successive phases of a master signal and recovering information relating the phase of the signal returned from the control to the position of the member. A light-emitting display may be 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.

REFERENCES:
patent: 3198937 (1965-08-01), Wooster
patent: 3760392 (1973-09-01), Stich
patent: 4007454 (1977-02-01), Cain et al.
patent: 4058765 (1977-11-01), Richardson et al.
patent: 4087625 (1978-05-01), Dym et al.
patent: 4103252 (1978-07-01), Bobick
patent: 4129747 (1978-12-01), Pepper
patent: 4177421 (1979-12-01), Thornburg

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