System for directly sensing the orientation of a track ball

Details System for directly sensing the orientation of a track ball System for directly sensing the orientation of a track ball

G - Physics

06

F

G06F 3/033 (2006.01)

Patent

CA 2169783

A track ball device includes a ball having a pattern of first conductive features and a socket into which the ball rotatably sits, the socket having a pattern of second conductive features. Also disclosed is a sensing array system for determining relative motion including a first substrate having a plurality of interstitially arranged electrodes provided thereon. A second substrate has a plurality of transfer electrodes- provided thereon. The first and second substrates are movable relative to each other, and the plurality of interstitially arranged electrodes selectively operate as driving electrodes for providing a plurality of signals to the sensing array and as collecting electrodes for collecting signals capacitively transferred from the driving electrodes by the transfer electrodes. The sensing array is useful in a battery operated track ball device, a mouse or other device that must be able to determine relative motion over two degrees of freedom.

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