Digitizer with serpentine-type conductor grid having uniform...

Details Digitizer with serpentine-type conductor grid having uniform... Digitizer with serpentine-type conductor grid having uniform...

G - Physics

08

C

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2115051

Disclosed herein are position determining apparatus and conductor structures or grids therefor. The conductor structure for each axis includes a number of conductors which are run in a serpentine-type path each with uniform repeat increment. The repeat increment, which is the spacing or span between one run and the next of the same serpentine-type conductor, are uniform for each conductor (but may change from conductor to conductor) and is constrained by a maximum repeat increment, or a minimum repeat increment. In the preferred embodiments, there is at least a constraint on the maximum repeat increment to provide noise immunity. The conductors are arranged for each axis of the grid in a pattern such that signals obtained for that axis may be processed to provide binary numbers in a Gray-type code, each unique to a small region of the active area in which the coil center is located.

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