Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-06-12
1980-11-11
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
34087037, 340347P, 361280, 361300, G06F 302, H01H 1900
Patent
active
042335930
ABSTRACT:
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 maintaining 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.
REFERENCES:
patent: 3068457 (1962-12-01), Nevius
patent: 3198937 (1965-08-01), Wooster
patent: 3222668 (1965-12-01), Lippel
patent: 3760392 (1973-09-01), Stich
patent: 3863235 (1975-01-01), McKee et al.
patent: 3924177 (1965-12-01), Lemineur et al.
patent: 4007454 (1977-02-01), Cain et al.
patent: 4058765 (1977-11-01), Richardson et al.
Caldwell Sr. John W.
Davis James C.
General Electric Company
Groody James J.
Krauss Geoffrey H.
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