Graphic tablet and method

Details Graphic tablet and method Graphic tablet and method

1982-12-30

1985-01-08

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

33 1M, G08C 2100

Patent

active

044928190

ABSTRACT:
A writing tablet is disclosed incorporating a plurality of conductors imbedded beneath the surface thereof in orthogonal relationship with respect to each other. The conductors form a grid for receiving radiated electric signals generated remote from the tablet and supplied to a pen acting as a radiating antenna. The radiated signals generate signals of varying amplitude in the respective grid conductors; the grid conductors in each of the X and Y directions are interconnected by resistors; terminals are provided at the outside conductors in the X and Y directions. The terminals are sequentially connected to a detector which in turn provides input signals to a dual slope integrator for ratioing the amplitude of the signal appearing at selected terminals. The output of the integrator is a timed wave form having a time value proportional to the position of the pen on the tablet surface.

REFERENCES:
patent: 3461454 (1969-08-01), Steckenrider
patent: 3626483 (1971-12-01), Whetstone et al.

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