Visual display input device

Details Visual display input device Visual display input device

G - Physics

06

F

375/4

G06F 3/033 (2006.01)

Patent

CA 1128221

ABSTRACT VISUAL DISPLAY INPUT DEVICE An input device for a computer controlled visual display enables an operator to instruct the shift of a display element in a chosen direction by hand movement of the input device sensor in an analogous direction over a plane surface. The sensor includes a conventional piezoelectric audio pick-up which produces a succession of unidirectional pulses when the stylus is drawn across a microscopically textured surface such as a sheet of paper, the polarity of the pulses being indicative of the direction of motion along a selected axis. A second pick-up is arranged to give a maximum response to motion along an orthogonal axis and for the component of motion on each axis a bi-directional pulse counter enables the direction of motion to be determined by a comparison of the counts held in successive time intervals.

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