Coordinate reading apparatus

Details Coordinate reading apparatus Coordinate reading apparatus

1981-02-27

1983-11-29

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 18, G08C 2100

Patent

active

044182422

ABSTRACT:
A coordinate reading apparatus is disclosed, which is comprised of a tablet including therein magnetic-field generating coils; a position detector responsive to magnetic fields induced by the magnetic-field generating coils, for producing an analogue electric signal corresponding to a desired position to be read on the tablet; and a processing unit for receiving the analogue electric signal from the position detector and for producing coordinate data corresponding to the desired position to be read on the tablet. Above the tablet, many cylindrical rotating magnetic fields are formed and arranged along each coordinate axis. By supplying alternating signals to the magnetic-field generating coils, the phases of the alternating signals are shifted with respect to each other. The position detector detects the rotating magnetic-field vector comprising components in phase. The phase component of the vector is processed so that the coordinate data can be read by means of the processing unit.

REFERENCES:
patent: 3819857 (1974-06-01), Inokuchi

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