Digitizer pen tilt correction employing wires near the data poin

Details Digitizer pen tilt correction employing wires near the data poin Digitizer pen tilt correction employing wires near the data poin

1989-11-06

1990-07-03

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

049393189

ABSTRACT:
In a digitizer tablet system employing a tablet having equally spaced parallel grid wires disposed in a plane along an axis parallel to the tablet's upper surface and a pen cursor having a sensing coil disposed concentric with and perpendicular to a longitudinal axis of the pen cursor to develop a characteristic output waveform from electromagnetic inductance between the grid wires and the sensing coil, this invention is the method of compensating a calculation of the position of the pen's tip on the tablet's upper surface and along the axis determined from an interpolation of the characteristic output waveform to find its zero voltage crossing point for tilt of the pen cursor longitudinal axis from perpendicular to the tablet's upper surface comprising using voltage values from grid wires next on opposite sides of the zero crossing point to calculate a pen tilt compensation factor.

REFERENCES:
patent: 3873770 (1975-03-01), Ioannou
patent: 4568799 (1986-02-01), Kobayashi et al.

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