Electronic two-directional control apparatus

Details Electronic two-directional control apparatus Electronic two-directional control apparatus

G - Physics

08

C

340/135.1

G08C 21/00 (2006.01)

Patent

CA 1127262

ABSTRACT An electronic two-directional control apparatus responsive to the capacitance of an external object for generating two elec- trical outputs simultaneously referable as co-ordinates defining the position of an external object in relation to a control surface, four sensing electrodes of approximately equal capacitance symmetri- cally arranged into pairs of opposing sensing electrodes within a common plane and electrically insulated from one another whereby sensing electrodes define a control surface and whereby sensing electrode capacitances independently vary in response to the proxi- mity of an external object thereto and are electrically connected to an electrical input in such fashion that only the positive portions of the oscillatory potential are equally applied to each sensing electrode; two pairs of resistors electrically connected to sensing electrodes for continuously receiving discharge currents originating from each pair of opposing sensing electrodes, res- pectively and whereby each discharge current is a function of corres- ponding sensing electrode capacitance; a detector circuit electrically connected to both pairs of resistors for simultaneously detecting both continuous discharge currents from each pair of resistors, de- tecting differences therebetween, and generating two electrical outputs respectively. The electronic two-directional control apparatus may be utilized in combination with a human body act on a universally rotatable mechanical control member for simultaneously generating two electrical outputs referable as co-ordinates defining the position of mechanical control member in relation to control surface.

334036

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