Digitizer tablet

Details Digitizer tablet Digitizer tablet

1982-07-12

1984-06-19

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

044554516

ABSTRACT:
A digitizer tablet providing accurate two-dimensional coordinate location of the position of a cursor over the entire surface of the tablet. The position values are derived from sequential pulse signals eminating from a grid matrix within the plane of the tablet and received by a magnetic pickup within the cursor body. The grid matrix is energized with signal pulses and arranged in a predistorted manner to extend the useful area of the tablet to include the edge of the grid matrix. Furthermore, the tablet matrix and the associated drive and calculating electronics are incorporated on a unitary circuit board wherein the electronics are within the tablet area useable for cursor location determination.

REFERENCES:
patent: 4213005 (1980-07-01), Cameron
patent: 4368352 (1983-01-01), Davis

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