发明名称 |
Digitizer with serpentine-type conductor grid having uniform conductor repeat increments |
摘要 |
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. The small region for a given axis corresponds to the space between two immediately adjacent, active conductor portions for that axis, with a possible ambiguity of one space. Small regions in each axis define the coarse location of the coil center. Fine location within a region may be determined from the magnitudes of currents induced in selected runs preferably by interpolation.
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申请公布号 |
US5210380(A) |
申请公布日期 |
1993.05.11 |
申请号 |
US19910741032 |
申请日期 |
1991.08.06 |
申请人 |
SUMMAGRAPHICS CORPORATION |
发明人 |
MCDERMOTT, ROBERT M.;SMITH, PAUL D.;MCDERMOTT, SCOTT |
分类号 |
G01B7/00;G01D5/12;G06F3/033;G06F3/041;G06F3/046;G06F3/047 |
主分类号 |
G01B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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