Boots – shoes – and leggings
Patent
1987-03-20
1989-05-16
Lall, Parshotam S.
Boots, shoes, and leggings
340709, 178 18, 178 19, 178 20, G08C 2100, G01B 714
Patent
active
048315664
ABSTRACT:
A conventional three-electrode wedge-and-strip pattern in a digitizer tablet surface is used with a conventional cursor or stylus. A phantom cursor electrode is located at predetermined coordinates of the active area of the digitizer tablet beneath the X, Y and balance (B) electrodes and separated therefrom by a layer of dielectric material, preferably an air gap. Prior to use of the digitizer apparatus, the phantom cursor electrode is electrostatically coupled to the X, Y and B electrodes in order to obtain data signals representing the phantom cursor's measured coordinates without compensation for resolution distortion. A microprocessor produces a correction factor using the data signals and the predefined coordinates of the phantom cursor electrode, which correction factor is applied in normal use to compensate for resolution distortion resulting from the unavoidable gaps between the X, Y and B electrodes. Also raw measured data obtained from the electrostatically coupled electrodes is adjusted to compensate for environmental and inherent noise and an offset corresponding to the difference in the reference potentials of the integrator and comparator.
REFERENCES:
patent: 4650926 (1987-03-01), Nakamura et al.
patent: 4661656 (1987-04-01), Rodgers et al.
patent: 4678869 (1987-07-01), Kable
patent: 4705919 (1987-11-01), Dhawan
patent: 4710595 (1987-12-01), Kimura
patent: 4733023 (1988-03-01), Tamaru et al.
patent: 4740660 (1988-04-01), Kimura
Barbetti Jamie L.
Matthews Henry G.
Mletzko Al
Zalenski Thomas
Lall Parshotam S.
Ramirez Ellis B.
Summagraphics Corporation
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