Low-power electromagnetic digitizer tablet

Details Low-power electromagnetic digitizer tablet Low-power electromagnetic digitizer tablet

1989-11-15

1990-08-28

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

049527576

ABSTRACT:
A low-power electromagnetic digitizer table employing triangular-shaped electrodes arrayed in a single plane. A pointing device coil when energized induces signal voltages in the electrodes underneath. The electrodes are scanned in timed relation, and the induced voltages digitized and compared to determine the X/Y coordinates of the pointing device with respect to the electrode array.

REFERENCES:
patent: 4087625 (1978-05-01), Dym et al.
patent: 4451698 (1984-05-01), Whetstone et al.
patent: 4659874 (1987-04-01), Landmeier
patent: 4705919 (1987-11-01), Dhawan
patent: 4771138 (1988-09-01), Dhawan

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