Apparatus for converting the position of a manually operated ins

Details Apparatus for converting the position of a manually operated ins Apparatus for converting the position of a manually operated ins

1976-02-05

1977-08-02

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

040397475

ABSTRACT:
An improved apparatus capable of converting the position of a pen-type sensor relative to the surface of a writing table into an electrical signal representative of such position and which may be utilized for control, data input or transmission purposes. The writing table includes two sets of independent, spaced-apart conducting wires which form a grid throughout the writing area. The conducting wires are individually and discretely pulsed sequentially to generate a time varying electrostatic field adjacent to the writing table that can be sensed by the sensor. The signal sensed by the sensor and the signals used to drive the time-varying electrostatic field are electronically processed and converted into electrical signals representing the position of the sensor relative to the writing table.

REFERENCES:
patent: 3539995 (1970-11-01), Brandt
patent: 3846580 (1974-11-01), Brenner
patent: 3851097 (1974-11-01), Rodgers
patent: 3904822 (1975-09-01), Kamm et al.

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