Method for use in a digitizer for determining pen tilt

Details Method for use in a digitizer for determining pen tilt Method for use in a digitizer for determining pen tilt

1991-11-27

1993-03-30

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

051986230

ABSTRACT:
A digitizer includes a tablet having an array of conductors, and a pen-shaped, coil-containing stylus. The digitizer applies an energizing signal to either the conductors or the stylus, which signal induces voltages in the other. Then, the digitizer detects the induced voltages corresponding to the conductors, which define a voltage waveform having a positive peak, a negative peak, and a zero-crossing therebetween. The digitizer corrects for pen tilt in determining stylus position on the tablet by determining a position value for the zero-crossing using voltages in a region between the positive and negative peaks of the waveform and generating a pen tilt correction value using the position value and voltages in a region outside the positive and negative peaks. Then, the pen-tilt correction value and a preferably cyclic-error-corrected value for the position of the zero-crossing are combined to yield a relatively accurate pen-tilt-compensated determination of stylus position. The pen-tilt value provided by the invention can also be used in other applications, e.g., hand-writing recognition and electronic calligraphy.

REFERENCES:
patent: 3873770 (1975-03-01), Ioannou
patent: 4418242 (1983-11-01), Kouno
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4568799 (1986-02-01), Kobayashi et al.
patent: 4577057 (1986-03-01), Blesser
patent: 4717793 (1988-01-01), Kobayashi
patent: 4928256 (1990-05-01), Parnell et al.
patent: 4939318 (1990-07-01), Watson et al.

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