G - Physics
06
K
375/11, 340/135.
G06K 11/06 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1256609
Abstract: The present invention relates to an improvement in a device for controlling the position of a visual display cursor. The device is movable on a surface having a pattern of relatively light and dark areas separated by edges and optically senses the motion of the device on the surface relative to two non-parallel axes so as to produce signals which represent a direction of motion for the cursor. The device includes a unit for optically sensing motion on any random surface pattern with edges. The unit is comprised of a plurality of prechargeable photon sensors disposed in a row along each axis, and a unit for periodically sensing the presence of an edge in at least one preselected portion of each row of sensors to define a sensor state for each axis to each period. A comparator is provided for comparing successive sensor states for each axis to determine if movement has occurred relative to each axis.
479282
Knight Thomas F.
Nestler Eric
Kirby Eades Gale Baker
Symbolics Inc.
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