Position determining and digitizing method and device

Details Position determining and digitizing method and device Position determining and digitizing method and device

1989-10-06

1991-03-12

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340710, G08C 2100

Patent

active

049994620

ABSTRACT:
A coordinate determining system, tablet, and method wherein the tablet is formed of a sequence of triangular electrodes extending in a first direction, with alternate electrodes having their apexes extending in opposite directions perpendicular to the first direction, and the bases of alternate electrodes are aligned to define the sides of the tablet. The cursor is round, having a diameter substantially equal to the length of the bases of the electrodes, and is adapted to be electrostatically coupled to the electrodes. Signals are sequentially applied to the electrodes and voltages generated at the cursor are employed to address look up tables for determining the location of the cursor.

REFERENCES:
patent: 4034155 (1977-07-01), Muller et al.
patent: 4087625 (1978-05-01), Dym et al.
patent: 4705919 (1987-11-01), Dhawan

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