Position determination apparatus

Details Position determination apparatus Position determination apparatus

1983-05-17

1985-03-26

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

045075239

ABSTRACT:
An electromagnetic-induction-type position determination apparatus or digitizer for inputting or digitizing hand-written characters and graphic equipment to electronic equipment is arranged so as to have a reduced number of conductors installed on its interface plate and has a reduced number of complicated control circuits. The apparatus includes an interface plate having conductors installed in the form of a matrix and a control system for supplying two currents to two conductors in the same direction. A pick-up is moveably positioned on the interface plate for picking up two induced voltages induced by magnetic fields generated by the two currents flowing through the two conductors and a detector and processor are arranged to detect a predetermined relationship between the two induced voltages and to derive digital coordinate data based on the detected predetermined relationship.

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