Tablet input device

Details Tablet input device Tablet input device

1978-05-24

1980-05-27

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 18, G08C 2100

Patent

active

042051991

ABSTRACT:
A tablet input device includes a manipulation pad with a group of parallel drive lines and a group of sense lines which are interlaced in parallel with the drive lines. A drive circuit is provided which sequentially scans the drive lines with a variable drive current. When an input pen indicates a point on the face of the manipulation pad and when one of the drive lines adjacent to this point is excited, a voltage is induced across one or more sense lines adjacent the excited drive line. A sense circuit is provided which detects the magnitude or the polarity of the induced voltage, thereby detecting the address of the point indicated by the input pen.

REFERENCES:
patent: 3598903 (1971-08-01), Johnson et al.

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